[build-tools] Make configure-version gradle script compatible with AGP 9

[gabrieldonadel]

Why

EAS injects an eas-build.gradle script into Android projects to set versionCode and versionName from the build job. That script sets per-output overrides through applicationVariants.all. AGP 9 removes the applicationVariants API from the new DSL, so the injected script breaks the Gradle configuration for project using react-native 0.87

How

The defaultConfig assignments stay unchanged. The per-output override block moves out of the android {} block and now picks an API at runtime:

• If the android extension still exposes applicationVariants (AGP 8 and older), the script keeps the existing versionCodeOverride / versionNameOverride path.
• Otherwise it uses the androidComponents.onVariants variant API and sets the versionCode / versionName properties on each output.

Test Plan

CI should be green

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.47%. Comparing base (d98d26d) to head (27dd2b4).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4155   +/-   ##
=======================================
  Coverage   62.47%   62.47%           
=======================================
  Files        1008     1008           
  Lines       45772    45772           
  Branches     9631     9631           
=======================================
  Hits        28590    28590           
  Misses      15721    15721           
  Partials     1461     1461           

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[github-actions]

✅ Thank you for adding the changelog entry!

[github-actions]

🤖 AI code review

Decision: Approve

Overall PR risk: High. The change modifies existing behavior: the generated eas-build-configure-version.gradle script, which runs on every EAS Android build. It moves the per-output version override out of the android {} block and picks an API at runtime based on whether applicationVariants exists. No reviewer found a concrete defect, but the blast radius is broad because the script applies to all Android builds that set versionCode or versionName. The most plausible failure is at build time in customer projects, not in unit tests: if the android extension lookup fails, or if the AGP 9 onVariants branch runs too late or the output properties are not writable, builds could fail or silently publish the wrong version. Rollback is simple (a template revert and redeploy), but detection would lag because CI does not exercise the generated script against real AGP 9 projects.

No findings.

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This review is advisory — it never blocks a merge and never auto-approves.