[eas-cli] Add --upload-source-maps to eas update

[douglowder]

Upload the source map that expo export emits for each native platform, so EAS Observe can symbolicate stack traces from an update.

The maps are not listed in metadata.json, so each one is located from the bundle that metadata.json does name, falling back to a single sibling .map file. sourcesContent is always stripped, which keeps application source text out of EAS storage and gives the map a chance of fitting under the 5 MiB upload limit. A map that is still too large is skipped with a warning; publishing never fails because of a source map.

The GraphQL schema for this is not deployed yet, so the new types live in graphql/sourceMapShim.ts. Once expo/universe#30154 ships, regenerate the GraphQL types, delete that file, and repoint its four importers. Grep for ENG-26889.

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[github-actions]

✅ Thank you for adding the changelog entry!

[linear-code]

ENG-26889

[codecov]

Codecov Report

❌ Patch coverage is 96.52174% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.37%. Comparing base (1677efc) to head (9a09a32).

Files with missing lines	Patch %	Lines
.../eas-cli/src/project/maybeUploadSourceMapsAsync.ts	97.83%	2 Missing ⚠️
packages/eas-cli/src/uploads.ts	33.34%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4436      +/-   ##
==========================================
+ Coverage   72.30%   72.37%   +0.07%     
==========================================
  Files         970      972       +2     
  Lines       46132    46245     +113     
  Branches     9902     9927      +25     
==========================================
+ Hits        33349    33463     +114     
- Misses      11788    11789       +1     
+ Partials      995      993       -2     

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