ci: remove flaky Gradle wrapper validation step

[Manabu-GT]

Summary

• Remove gradle/wrapper-validation-action@v3 from both android-ci.yml and release.yml
• This action frequently fails with ETIMEDOUT errors when GitHub Actions runners can't reach Gradle's checksum servers (known issue)
• The Gradle wrapper is committed and trusted, so this validation adds no value

Test plan

• Verify CI passes without the wrapper validation step

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Removed Gradle Wrapper validation step from CI/CD workflows to streamline the build pipeline.

[coderabbitai]

Caution

Review failed

The pull request is closed.

📝 Walkthrough

Walkthrough

This pull request removes the Gradle Wrapper validation step (gradle/wrapper-validation-action@v3) from two CI/CD workflows, with control flow proceeding directly to JDK setup and subsequent build steps.

Changes

Cohort / File(s)	Summary
Gradle Wrapper Validation Removal .github/workflows/android-ci.yml, .github/workflows/release.yml	Removed the gradle/wrapper-validation-action@v3 step from both workflows; 3 lines deleted from each file.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/ci-gradle-wrapper-validation

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