Use exec when launching Gradle

[sjchmiela]

Summary

Use exec in the shell wrapper that launches Gradle from both build-tools Gradle entry points.

This replaces the intermediate shell process with gradlew. Supposedly it's better.

Stepping stone to #3898.

[codecov]

Codecov Report

❌ Patch coverage is 23.52941% with 26 lines in your changes missing coverage. Please review.
✅ Project coverage is 59.03%. Comparing base (99fba8c) to head (f15ecd7).

Files with missing lines	Patch %	Lines
packages/build-tools/src/utils/gradle.ts	21.22%	26 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3897      +/-   ##
==========================================
+ Coverage   59.03%   59.03%   +0.01%     
==========================================
  Files         935      937       +2     
  Lines       40931    40937       +6     
  Branches     8622     8622              
==========================================
+ Hits        24158    24163       +5     
- Misses      16677    16678       +1     
  Partials       96       96              

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[github-actions]

⏩ The changelog entry check has been skipped since the "no changelog" label is present.