[CI] Preserve xcresult bundle structure in CI artifacts

[Kyle-Ye]

Summary

• Zip the .xcresult bundle before uploading to preserve its macOS package structure
• Bump upload-artifact from v4 to v7 with archive: false to avoid double-zipping

Fixes the issue where downloading the macos-uitest-snapshots-xcresult.zip artifact would produce a flat macos-uitest-snapshots-xcresult/ folder instead of a proper .xcresult bundle.

Reference: actions/upload-artifact#39

Test plan

• Trigger a UI test failure and verify the downloaded xcresult artifact extracts as a valid .xcresult bundle openable in Xcode

[augmentcode]

🤖 Augment PR Summary

Summary: Ensures UI-test .xcresult artifacts keep their bundle/package structure when downloaded from CI.

Changes: Zips the generated .xcresult on failure and uploads the resulting zip via actions/upload-artifact@v7 with archive: false to avoid flattening/double-zipping.

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[augmentcode]

Review completed. 1 suggestion posted.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 27.17%. Comparing base (ff8c99a) to head (7d8f107).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #830       +/-   ##
===========================================
+ Coverage   13.83%   27.17%   +13.33%     
===========================================
  Files         630      667       +37     
  Lines       38173    42953     +4780     
===========================================
+ Hits         5283    11671     +6388     
+ Misses      32890    31282     -1608     

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