[build-tools] Normalize project archive permissions

[AbbanMustafa]

Why

A regression review found 664 prebuild failures across 227 apps and 221 accounts with EACCES errors while reading project assets.

View the affected logs in Datadog

Project archives can preserve modes that leave files unreadable or directories unwritable by the build user.

How

After extracting the project archive, grant the build user read/write access while preserving executable bits.

Test Plan

• Added a unit test verifying extraction is followed by chmod -R u+rwX.
• Locally archived the app icon with mode 000; without the fix, Prebuild failed with EACCES while reading it.
• Rebuilt the same corrupted archive with the fix enabled; Prebuild and the full iOS build succeeded.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.52%. Comparing base (a9d693d) to head (7b4093c).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4202      +/-   ##
==========================================
+ Coverage   63.52%   63.52%   +0.01%     
==========================================
  Files        1028     1028              
  Lines       46918    46919       +1     
  Branches     9847     9847              
==========================================
+ Hits        29801    29802       +1     
  Misses      17015    17015              
  Partials      102      102              

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[github-actions]

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