Add support for disabling encryption and authentication - Kafka Exporter

[scholzj]

Type of change

• Task

Description

This PR continues the work on disabling TLS encryption and mTLS authentication in the Kafka clusters. This PR focuses on Kafka Exporter. It handles TLS and mTLS on the Kafka client level based on whether the certificate volumes are mounted or not.

Checklist

• Write tests
• Make sure all tests pass
• Try your changes inside a Kubernetes cluster, not just from unit tests
• AI assistance was used to create this PR (see the Strimzi AI policy)

[snyk-io]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scan Engine	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues
✅	Licenses	0	0	0	0	0 issues
✅	Code Security	0	0	0	0	0 issues

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.58%. Comparing base (68374f1) to head (f581ca9).

Additional details and impacted files

@@                                         Coverage Diff                                         @@
##             scholzj/add-none-encryption-and-authentication-cruise-control   #13039      +/-   ##
===================================================================================================
+ Coverage                                                            80.57%   80.58%   +0.01%     
- Complexity                                                            6577     6581       +4     
===================================================================================================
  Files                                                                  344      344              
  Lines                                                                22771    22776       +5     
  Branches                                                              3107     3111       +4     
===================================================================================================
+ Hits                                                                 18348    18355       +7     
+ Misses                                                                3206     3205       -1     
+ Partials                                                              1217     1216       -1     

Files with missing lines	Coverage Δ
.../strimzi/operator/cluster/model/KafkaExporter.java	94.64% <100.00%> (+0.25%)	⬆️
...uster/operator/assembly/KafkaAssemblyOperator.java	84.47% <ø> (ø)
...ter/operator/assembly/KafkaExporterReconciler.java	97.22% <100.00%> (ø)

... and 2 files with indirect coverage changes

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[scholzj]

/gha run pipeline=regression

[github-actions]

⏳ System test verification started: link

The following 6 job(s) will be executed:

• regression-brokers-and-security-amd64 (cncf-ubuntu-8-32-x86)
• regression-operators-amd64 (cncf-ubuntu-8-32-x86)
• regression-operands-amd64 (cncf-ubuntu-8-32-x86)
• regression-brokers-and-security-arm64 (cncf-ubuntu-8-32-arm)
• regression-operators-arm64 (cncf-ubuntu-8-32-arm)
• regression-operands-arm64 (cncf-ubuntu-8-32-arm)

Tests will start after successful build completion.

[github-actions]

❌ System test verification failed: link

[scholzj]

Note: The system tests actually passed. Only the result publishing timed out.