[eas-cli] Add --link-project-id flag to eas build

[williamgrosset]

Why

Users/agents should be able to assert which EAS project a build should belong to.

How

• Added --link-project-id <id> to eas build to link the directory to an existing project before building, like eas init --id (writes extra.eas.projectId). Supports non-interactive: eas build -p ios --link-project-id <id> --non-interactive.
• Default is an assertion: if the config already points at a different project (or the owner/slug conflict), the build fails in non-interactive mode without --force; interactively it prompts to overwrite. --force deliberately relinks.

Test Plan

Manually verified an EAS project is successfully linked and eas build continues it's execution:

link-project-id-flag.mov

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.53%. Comparing base (eab32ec) to head (4c5d06f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4138      +/-   ##
==========================================
+ Coverage   62.43%   62.53%   +0.11%     
==========================================
  Files        1009     1009              
  Lines       45737    45753      +16     
  Branches     9622     9627       +5     
==========================================
+ Hits        28550    28608      +58     
+ Misses      15726    15690      -36     
+ Partials     1461     1455       -6     

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[github-actions]

✅ Thank you for adding the changelog entry!