[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

❌ Patch coverage is 87.09677% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.41%. Comparing base (99b18a2) to head (1781283).

Files with missing lines	Patch %	Lines
packages/eas-cli/src/build/metadata.ts	42.86%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3725      +/-   ##
==========================================
+ Coverage   56.36%   56.41%   +0.06%     
==========================================
  Files         897      902       +5     
  Lines       38773    38857      +84     
  Branches     8059     8069      +10     
==========================================
+ Hits        21849    21919      +70     
- Misses      16818    16831      +13     
- Partials      106      107       +1     

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[github-actions]

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[github-actions]

✅ Thank you for adding the changelog entry!