style(lint, android): format+ignore version file to avoid flaky lint exit

[mikehardy]

Summary

• Emit ReactNativeFirebaseVersion.java from genversion in google-java-format-compatible layout (no leading newline; blank line after package).
• Exclude the gitignored generated version file from lint:android so --set-exit-if-changed cannot fail when tracked sources are already clean.

Motivation

lint:android could fail intermittently (~1 in 20–30 runs) with google-java-format exit 1 and an empty git diff. Investigation showed the gitignored generated ReactNativeFirebaseVersion.java was included in the formatter pass after prepare regenerated it with slightly non-compliant whitespace.

Test plan

• node packages/app/scripts/genversion-android.js then google-java-format --set-exit-if-changed on the version file exits 0
• 30× loop of regen + yarn lint:android passes
• CI lint checks green

Checklist

• I read the Contributor Guide and followed the process for submitting PRs.
  • Yes
• My change supports the following platforms;
  • Android
  • iOS
  • Other (macOS, web)
• My change includes tests;
  • e2e tests added or updated in packages/**/e2e
  • jest tests added or updated in packages/**/__tests__
• I have updated TypeScript types that are affected by my change.
• This is a breaking change;
  • Yes
  • No

[gemini-code-assist]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 46.19%. Comparing base (1bad118) to head (788acbd).

Additional details and impacted files

@@              Coverage Diff              @@
##               main    #9101       +/-   ##
=============================================
- Coverage     58.66%   46.19%   -12.47%     
+ Complexity     1617     1616        -1     
=============================================
  Files           503      503               
  Lines         39180    39184        +4     
  Branches       5807     5744       -63     
=============================================
- Hits          22981    18097     -4884     
- Misses        14800    19807     +5007     
+ Partials       1399     1280      -119     

Flag	Coverage Δ
android-native	53.56% <ø> (-<0.01%)	⬇️
e2e-ts-android	49.98% <ø> (-0.02%)	⬇️
e2e-ts-ios	18.79% <ø> (-35.15%)	⬇️
e2e-ts-macos	41.48% <ø> (-<0.01%)	⬇️
ios-native	18.79% <ø> (-35.15%)	⬇️
jest	49.58% <ø> (ø)

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