[eas-cli] Improve iOS config fallback Sentry diagnostics

[sjchmiela]

Summary

• capture an explicit iOS entitlements config fallback Sentry message so this fallback is easier to find than the generic spawn error
• tag the event with app/build/config-resolution metadata
• include spawn failure details in a JSON extra, preserving empty stdout/stderr as ""
• add a changelog entry

Test plan

• yarn workspace eas-cli typecheck
• git diff --check

[github-actions]

Subscribed to pull request

File Patterns	Mentions
**/*	@douglowder

Generated by CodeMention

[codecov]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.83%. Comparing base (51fb25c) to head (f49d315).

Files with missing lines	Patch %	Lines
packages/eas-cli/src/project/ios/entitlements.ts	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3763      +/-   ##
==========================================
+ Coverage   56.83%   56.83%   +0.01%     
==========================================
  Files         903      903              
  Lines       39058    39056       -2     
  Branches     8167     8167              
==========================================
  Hits        22193    22193              
+ Misses      15398    15396       -2     
  Partials     1467     1467              

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[github-actions]

✅ Thank you for adding the changelog entry!