feature(eas-cli): add worker --alias flag

[byCedric]

This PR is stacked on top of #2548, since we use the alias mutation here too.

Why

This adds the eas worker --alias <name>, to assign a custom alias when deploying.

How

• Added --alias and used the existing deployment alias mutation

Test Plan

$ eas worker --alias

$ eas worker --prod --alias

[github-actions]

Size Change: +1.59 kB (0%)

Total Size: 52.9 MB

Filename	Size	Change
./packages/eas-cli/dist/eas-linux-x64.tar.gz	52.9 MB	+1.59 kB (0%)

_{compressed-size-action}

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.

Project coverage is 52.27%. Comparing base (feaa8cb) to head (7076921).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/eas-cli/src/commands/worker/deploy.ts	0.00%	6 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2551      +/-   ##
==========================================
- Coverage   52.28%   52.27%   -0.01%     
==========================================
  Files         557      557              
  Lines       20982    20989       +7     
  Branches     4282     4283       +1     
==========================================
  Hits        10969    10969              
- Misses       9152     9158       +6     
- Partials      861      862       +1     

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[github-actions]

✅ Thank you for adding the changelog entry!