Reset Gradle oom score before launch

[sjchmiela]

Summary

Replace the delayed Gradle descendant oom_score_adj scan with an immediate shell-level reset before launching Gradle.

The worker service is protected with OOMScoreAdjust=-999, so Gradle inherits that value unless we reset it. This changes the Gradle launch wrapper to write 0 to /proc/$$/oom_score_adj before exec ./gradlew ..., which makes Gradle and its child processes inherit the default OOM score instead of the worker's protected score.

This PR is stacked on #3897.

Validation

• yarn --cwd packages/build-tools typecheck
• yarn oxfmt --check packages/build-tools/src/android/gradle.ts packages/build-tools/src/steps/utils/android/gradle.ts
• yarn oxlint --type-aware --import-plugin --tsconfig ./tsconfig.oxlint.json packages/build-tools/src/android/gradle.ts packages/build-tools/src/steps/utils/android/gradle.ts

[codecov]

Codecov Report

❌ Patch coverage is 20.00000% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.06%. Comparing base (f15ecd7) to head (71bce04).

Files with missing lines	Patch %	Lines
packages/build-tools/src/utils/gradle.ts	20.00%	4 Missing ⚠️

Additional details and impacted files

@@                      Coverage Diff                       @@
##           stanley/gradle-launch-exec    #3898      +/-   ##
==============================================================
+ Coverage                       59.03%   59.06%   +0.04%     
==============================================================
  Files                             937      936       -1     
  Lines                           40937    40906      -31     
  Branches                         8622     8623       +1     
==============================================================
- Hits                            24163    24159       -4     
+ Misses                          16678    16651      -27     
  Partials                           96       96              

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[github-actions]

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