[eas-build-job] Preserve workflow job outputs

[sjchmiela]

Summary

This adds a shared JobOutputs type/schema and preserves declared workflow job outputs in Android, iOS, and generic job definitions.

Before this change, outputs was stripped from several build job shapes during Joi validation, including normal build jobs and custom builds that use customBuildConfig.path. That meant downstream worker code could not upload jobs.<name>.outputs for workflow type: build jobs.

Changes

• Add shared JobOutputs, JobOutputsSchema, and JobOutputsSchemaZ definitions in common.ts.
• Use the shared output type/schema from Android, iOS, and Generic job definitions.
• Validate outputs directly on the Android and iOS top-level job schemas.
• Remove output handling from CustomBuildConfigSchema, so that schema only controls custom config vs inline step shape.
• Add Android and iOS schema coverage for normal build jobs, config-path custom jobs, and iOS resign jobs.

Validation

• packages/eas-build-job: yarn test android.test.ts ios.test.ts generic.test.ts
• packages/eas-build-job: yarn build
• yarn oxfmt --check ...

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.59%. Comparing base (f856d40) to head (e98d716).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3704      +/-   ##
==========================================
+ Coverage   56.59%   56.59%   +0.01%     
==========================================
  Files         888      888              
  Lines       38496    38498       +2     
  Branches     8026     8026              
==========================================
+ Hits        21784    21786       +2     
  Misses      16614    16614              
  Partials       98       98              

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