[build-tools] add parseXcactivitylogFunction

[hSATAC]

Why

iOS builds currently have no visibility into per-module compile timing. Developers can't easily identify which targets are slow. Xcode generates .xcactivitylog files with detailed build timing data, but since Xcode 11 the CLI (xcodebuild) only produces them when -resultBundlePath is provided — which our Fastlane templates didn't include.

Linear: ENG-20491

How

• Add result_bundle(true) and result_bundle_path to both Gymfile templates (archive + simulator) to trigger xcactivitylog generation. Also add derived_data_path to the archive template so the xcactivitylog lands in a known location (ios/build).
• Add parseAndReportXcactivitylog() utility that downloads a pre-built XCLogParser binary, parses the xcactivitylog into JSON, and logs a per-module compile metrics table. Never fails the build — all errors are caught and logged as warnings.
• Register eas/parse_xcactivitylog as a built-in step function (opt-in for custom workflows).
• Also call parseAndReportXcactivitylog() in the traditional iOS builder flow under a new PARSE_XCACTIVITYLOG build phase, gated behind EXPERIMENTAL_EAS_XCACTIVITYLOG=1 env var.
• Add PARSE_XCACTIVITYLOG to the BuildPhase enum in @expo/eas-build-job (requires publishing a new version and updating the dependency in universe for the display name to render correctly on the website).

Test Plan

• Automation tests
• Tested locally
• To enable in traditional builds, set EXPERIMENTAL_EAS_XCACTIVITYLOG=1 in build profile env

[linear]

ENG-20491 Integrate xcactivitylog parsing into iOS build steps

[codecov]

Codecov Report

❌ Patch coverage is 71.91781% with 41 lines in your changes missing coverage. Please review.
✅ Project coverage is 54.35%. Comparing base (c6d4fae) to head (ceafe48).

Files with missing lines	Patch %	Lines
...s/build-tools/src/steps/utils/ios/xcactivitylog.ts	72.94%	36 Missing ⚠️
...ld-tools/src/steps/functions/parseXcactivitylog.ts	50.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3578      +/-   ##
==========================================
+ Coverage   54.27%   54.35%   +0.08%     
==========================================
  Files         820      822       +2     
  Lines       35055    35201     +146     
  Branches     7260     7283      +23     
==========================================
+ Hits        19024    19129     +105     
- Misses      15944    15985      +41     
  Partials       87       87              

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[github-actions]

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[github-actions]

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