Remove Samza runner support

[Abacn]

Please add a meaningful description for your change here

For #35448. Keep the tracking issue open in case there are leftovers or follow ups

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[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request removes the Samza runner support from the Apache Beam repository. This includes deleting all source code, build scripts, tests, and configuration files associated with the Samza runner. Additionally, it updates issue templates and documentation to reflect this change, ensuring that references to the Samza runner are removed or replaced where appropriate.

Highlights

• Removal of Samza Runner: Removed all source code, build configurations, and tests related to the Samza runner.
• Issue Template Updates: Updated issue templates to replace 'Samza Runner' with 'Prism Runner' in the component labels.
• Configuration and Documentation: Updated .github/autolabeler.yml, .github/issue-rules.yml, .test-infra/validate-runner/src/main/resources/configuration.yaml, and CHANGES.md to reflect the removal of Samza support.

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Ignored Files

• Ignored by pattern: .github/workflows/** (6)
  • .github/workflows/README.md
  • .github/workflows/beam_PostCommit_Go_VR_Samza.yml
  • .github/workflows/beam_PostCommit_Java_PVR_Samza.yml
  • .github/workflows/beam_PostCommit_Java_ValidatesRunner_Samza.yml
  • .github/workflows/beam_PostCommit_Python_ValidatesRunner_Samza.yml
  • .github/workflows/beam_PostCommit_XVR_Samza.yml

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[Abacn]

Merge after Beam 2.73.0 release, as it deleted all Samza runner test GitHub Actions

[github-actions]

Checks are failing. Will not request review until checks are succeeding. If you'd like to override that behavior, comment assign set of reviewers