Fix #6186: Separate add break between binary_deployable.jar and remaining build process.

[ShankhanilSaha]

Explanation

Fixes #6186

• In build_tests.yml and stats.yml breaking adding bazel shutdown between building up-to //:oppia_flavor_binary_deploy.jar (last target before proguard gets triggered) and remaining build process to free up JVM memory and avoiding OOM issues ultimately causing proguard flakes in CI.

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Summary by CodeRabbit

• Chores
  • Improved automated Android build workflows for non-development release variants.
  • Optimized the build sequence to generate deployment artifacts before final app bundles.
  • Streamlined branch comparison builds while preserving development, alpha, beta, and GA app bundle outputs.

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Coverage Report

Results

Coverage Analysis: SKIP ⏭️

This PR did not introduce any changes to Kotlin source or test files.

To learn more, visit the Oppia Android Code Coverage wiki page

[ShankhanilSaha]

@BenHenning I confirmed that the deployable build includes the heavy Proguard step. With this PR, the flake should be fixed because we now shut down Bazel after that step, releasing accumulated JVM memory before building the final AAB that packages the Proguard map.

[ShankhanilSaha]

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