[eas-cli] Add expoPackageVersion to build metadata

[sjchmiela]

Why

Persist the installed expo package version separately from sdkVersion so server-side log uploads can reproduce the legacy expo_package_version Datadog tag without conflating it with SDK version.

How

• Added expoPackageVersion to build metadata schema/types.
• Moved the existing worker getExpoPackageVersionAsync(...) behavior into shared @expo/eas-build-job#getInstalledExpoPackageVersionAsync(...): node --print require.resolve('expo/package.json'), fs.readJson, semver validation, and the same EAS_BUILD_EXPO_PACKAGE_VERSION_* UserErrors.
• collectMetadataAsync(...) now resolves expoPackageVersion inline with asyncResult(getInstalledExpoPackageVersionAsync(...)).value, so build creation and the existing internal updateBuildMetadata path send it alongside the rest of the build metadata.
• Worker error-log tags now read expo_package_version from build metadata; the worker no longer resolves or mutates this field.

Test Plan

CI should pass.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.70%. Comparing base (ae65e74) to head (5eb632a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3725      +/-   ##
==========================================
+ Coverage   56.64%   56.70%   +0.06%     
==========================================
  Files         892      897       +5     
  Lines       38541    38615      +74     
  Branches     8024     8030       +6     
==========================================
+ Hits        21828    21893      +65     
- Misses      16615    16623       +8     
- Partials       98       99       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[github-actions]

✅ Thank you for adding the changelog entry!