chore: drop Node.js 20 support

[svozza]

Summary

AWS Lambda marks the nodejs20.x runtime as deprecated on 2026-04-30 and will block new-function creation from 2026-06-01. This drops Node.js 20 from the supported runtimes so we stop running integration tests against a runtime we can no longer deploy, 4 weeks ahead of the Lambda cut-off. Supported runtimes going forward: nodejs22.x and nodejs24.x; minimum engines.node is now >=22.

Changes

• Remove 20 from the CI matrix in quality_check.yml, reusable-run-linting-check-and-unit-tests.yml, and run-e2e-tests.yml
• Bump root package.json engines.node to >=22 and tsconfig.json target to ES2024
• Remove Runtime.NODEJS_20_X from the layer's compatibleRuntimes, bump the canary runtime to NODEJS_22_X, and update the layer-publisher unit test assertion
• Drop the nodejs20x entry from TEST_RUNTIMES in packages/testing/src/constants.ts
• Remove test:e2e:nodejs20x scripts from all package package.json files (layers + 10 packages)
• Update hardcoded AWS_EXECUTION_ENV / runtime strings to nodejs22.x in test setup (setupEnv.ts, populateEnvironmentVariables.ts, Tracer.test.ts, testingMetadata.ts)
• Remove the 20.x option from the bug report template and bump the NodeSupport README badge to 22|24
• Update docs (lambda-layers.md, versioning.md) and the awsSdkUtils.ts JSDoc example
• Bump Runtime.NODEJS_20_X to NODEJS_22_X in example CDK constructs and the Terraform snippet
• Remove the now-dead describe.skipIf(getRuntimeKey() === 'nodejs20x') guard in durableIdempotent.test.ts

Issue number: closes #4906

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[svozza]

E2E tests passing: https://github.com/aws-powertools/powertools-lambda-typescript/actions/runs/25191086347/job/73860973853