[GH Actions] tackle unmaintained Gradle GH actions

[snazy]

This change replaces the now unmaintained gradle/gradle-build-action with gradle/actions/setup-gradle.

Also remove the unmaintained gradle/wrapper-validation-action w/o a replacement, assuming #36771 is going in.

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Summary of Changes

Hello @snazy, I'm Gemini Code Assist[^1]! 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 updates the GitHub Actions workflows to use current and maintained Gradle actions. The primary goal is to ensure the continuous integration pipeline remains robust and reliable by replacing deprecated actions with their modern counterparts, thereby preventing potential build failures or security vulnerabilities associated with unmaintained tools.

Highlights

• Gradle Action Update: The unmaintained gradle/gradle-build-action has been replaced with the actively maintained gradle/actions/setup-gradle action, specifically using version v5.
• Wrapper Validation Removal: The gradle/wrapper-validation-action has been removed without a direct replacement, anticipating that related functionality will be addressed by pull request #36771.
• Gradle Wrapper Validation Configuration: The new setup-gradle action has been configured with validate-wrappers: false.

Ignored Files

• Ignored by pattern: .github/workflows/** (1)
  • .github/workflows/code_completion_plugin_tests.yml

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[shunping]

This is actually causing workflows like this https://github.com/apache/beam/actions/workflows/beam_PostCommit_Python_Examples_Flink.yml to fail.

It seems that the action introduced here requires a newer version of runner image (the error is the same as https://github.com/apache/beam/issues/37115). I am in the middle of updating that, so I don't think we need to revert this PR for now. The new runner image is in place now and the workflow is green again.