Add unit tests to GTFS-RT parse and validate Airflow operators

[ohrite]

Description

This PR adds unit test coverage to the GTFS-RT DAG by way of extracting operators and porting behavioral tests.

Relates to #4488

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation

How has this been tested?

pytest and local Airflow

Post-merge follow-ups

• No action required
• Actions required (specified below)

Monitor staging Airflow

[github-actions]

Terraform plan in iac/cal-itp-data-infra/composer/us

No changes. Your infrastructure matches the configuration.

No changes. Your infrastructure matches the configuration.

Terraform has compared your real infrastructure against your configuration
and found no differences, so no changes are needed.

📝 Plan generated in Plan Terraform for Warehouse and DAG changes #1917

[github-actions]

Terraform plan in iac/cal-itp-data-infra-staging/airflow/us

Plan: 2 to add, 2 to change, 0 to destroy.

Terraform used the selected providers to generate the following execution
plan. Resource actions are indicated with the following symbols:
+   create
!~  update in-place

Terraform will perform the following actions:

  # google_storage_bucket_object.calitp-staging-composer["dags/parse_and_validate_gtfs_rt.py"] will be created
+   resource "google_storage_bucket_object" "calitp-staging-composer" {
+       bucket         = "calitp-staging-composer"
+       content        = (sensitive value)
+       content_type   = (known after apply)
+       crc32c         = (known after apply)
+       detect_md5hash = "different hash"
+       generation     = (known after apply)
+       id             = (known after apply)
+       kms_key_name   = (known after apply)
+       md5hash        = (known after apply)
+       md5hexhash     = (known after apply)
+       media_link     = (known after apply)
+       name           = "dags/parse_and_validate_gtfs_rt.py"
+       output_name    = (known after apply)
+       self_link      = (known after apply)
+       source         = "../../../../airflow/dags/parse_and_validate_gtfs_rt.py"
+       storage_class  = (known after apply)
    }

  # google_storage_bucket_object.calitp-staging-composer["plugins/operators/gtfs_rt_feed_to_jsonl_operator.py"] will be created
+   resource "google_storage_bucket_object" "calitp-staging-composer" {
+       bucket         = "calitp-staging-composer"
+       content        = (sensitive value)
+       content_type   = (known after apply)
+       crc32c         = (known after apply)
+       detect_md5hash = "different hash"
+       generation     = (known after apply)
+       id             = (known after apply)
+       kms_key_name   = (known after apply)
+       md5hash        = (known after apply)
+       md5hexhash     = (known after apply)
+       media_link     = (known after apply)
+       name           = "plugins/operators/gtfs_rt_feed_to_jsonl_operator.py"
+       output_name    = (known after apply)
+       self_link      = (known after apply)
+       source         = "../../../../airflow/plugins/operators/gtfs_rt_feed_to_jsonl_operator.py"
+       storage_class  = (known after apply)
    }

  # google_storage_bucket_object.calitp-staging-composer-catalog will be updated in-place
!~  resource "google_storage_bucket_object" "calitp-staging-composer-catalog" {
!~      content             = (sensitive value)
!~      crc32c              = "n61rBA==" -> (known after apply)
!~      detect_md5hash      = "zk9XqSQyX8VMcQoviaMv2Q==" -> "different hash"
!~      generation          = 1777671557648398 -> (known after apply)
        id                  = "calitp-staging-composer-data/warehouse/target/catalog.json"
!~      md5hash             = "zk9XqSQyX8VMcQoviaMv2Q==" -> (known after apply)
        name                = "data/warehouse/target/catalog.json"
#        (16 unchanged attributes hidden)
    }

  # google_storage_bucket_object.calitp-staging-composer-manifest will be updated in-place
!~  resource "google_storage_bucket_object" "calitp-staging-composer-manifest" {
!~      content             = (sensitive value)
!~      crc32c              = "nSDRww==" -> (known after apply)
!~      detect_md5hash      = "+GI7CKcGvoTWgbI8/Su3MQ==" -> "different hash"
!~      generation          = 1777671558808840 -> (known after apply)
        id                  = "calitp-staging-composer-data/warehouse/target/manifest.json"
!~      md5hash             = "+GI7CKcGvoTWgbI8/Su3MQ==" -> (known after apply)
        name                = "data/warehouse/target/manifest.json"
#        (16 unchanged attributes hidden)
    }

Plan: 2 to add, 2 to change, 0 to destroy.

📝 Plan generated in Plan Terraform for Warehouse and DAG changes #1917

[github-actions]

Terraform plan in iac/cal-itp-data-infra/airflow/us

Plan: 2 to add, 2 to change, 0 to destroy.

Terraform used the selected providers to generate the following execution
plan. Resource actions are indicated with the following symbols:
+   create
!~  update in-place

Terraform will perform the following actions:

  # google_storage_bucket_object.calitp-composer["dags/parse_and_validate_gtfs_rt.py"] will be created
+   resource "google_storage_bucket_object" "calitp-composer" {
+       bucket         = "calitp-composer"
+       content        = (sensitive value)
+       content_type   = (known after apply)
+       crc32c         = (known after apply)
+       detect_md5hash = "different hash"
+       generation     = (known after apply)
+       id             = (known after apply)
+       kms_key_name   = (known after apply)
+       md5hash        = (known after apply)
+       md5hexhash     = (known after apply)
+       media_link     = (known after apply)
+       name           = "dags/parse_and_validate_gtfs_rt.py"
+       output_name    = (known after apply)
+       self_link      = (known after apply)
+       source         = "../../../../airflow/dags/parse_and_validate_gtfs_rt.py"
+       storage_class  = (known after apply)
    }

  # google_storage_bucket_object.calitp-composer["plugins/operators/gtfs_rt_feed_to_jsonl_operator.py"] will be created
+   resource "google_storage_bucket_object" "calitp-composer" {
+       bucket         = "calitp-composer"
+       content        = (sensitive value)
+       content_type   = (known after apply)
+       crc32c         = (known after apply)
+       detect_md5hash = "different hash"
+       generation     = (known after apply)
+       id             = (known after apply)
+       kms_key_name   = (known after apply)
+       md5hash        = (known after apply)
+       md5hexhash     = (known after apply)
+       media_link     = (known after apply)
+       name           = "plugins/operators/gtfs_rt_feed_to_jsonl_operator.py"
+       output_name    = (known after apply)
+       self_link      = (known after apply)
+       source         = "../../../../airflow/plugins/operators/gtfs_rt_feed_to_jsonl_operator.py"
+       storage_class  = (known after apply)
    }

  # google_storage_bucket_object.calitp-composer-catalog will be updated in-place
!~  resource "google_storage_bucket_object" "calitp-composer-catalog" {
!~      content             = (sensitive value)
!~      crc32c              = "Ku/hRQ==" -> (known after apply)
!~      detect_md5hash      = "J/vXFF0Zm0pGSz3pVH1Qwg==" -> "different hash"
!~      generation          = 1777671559668369 -> (known after apply)
        id                  = "calitp-composer-data/warehouse/target/catalog.json"
!~      md5hash             = "J/vXFF0Zm0pGSz3pVH1Qwg==" -> (known after apply)
        name                = "data/warehouse/target/catalog.json"
#        (16 unchanged attributes hidden)
    }

  # google_storage_bucket_object.calitp-composer-manifest will be updated in-place
!~  resource "google_storage_bucket_object" "calitp-composer-manifest" {
!~      content             = (sensitive value)
!~      crc32c              = "WTgTJg==" -> (known after apply)
!~      detect_md5hash      = "cPI7QSTY+2+HBdabV3Mh2w==" -> "different hash"
!~      generation          = 1777671561135128 -> (known after apply)
        id                  = "calitp-composer-data/warehouse/target/manifest.json"
!~      md5hash             = "cPI7QSTY+2+HBdabV3Mh2w==" -> (known after apply)
        name                = "data/warehouse/target/manifest.json"
#        (16 unchanged attributes hidden)
    }

Plan: 2 to add, 2 to change, 0 to destroy.

📝 Plan generated in Plan Terraform for Warehouse and DAG changes #1917