feature(eas-cli): add worker:alias --json support for 3rd parties and custom tooling

[byCedric]

Why

With eas worker:alias --json, we can integrate with other tooling (such as expo-github-action). This adds support for exactly that.

How

• Swapped the beta warning from Log.warn to console.warn, avoiding polluting the JSON output
• Added --json only output to eas worker:alias --json command

Test Plan

eas worker:alias --json

eas worker:alias --id xxx --json

eas worker:alias --alias pr-test --json

eas worker:alias --id xxx --alias pr-test --json

[github-actions]

Size Change: -537 B (0%)

Total Size: 52.9 MB

Filename	Size	Change
./packages/eas-cli/dist/eas-linux-x64.tar.gz	52.9 MB	-537 B (0%)

_{compressed-size-action}

[github-actions]

✅ Thank you for adding the changelog entry!

[codecov]

Codecov Report

Attention: Patch coverage is 9.09091% with 20 lines in your changes missing coverage. Please review.

Project coverage is 52.19%. Comparing base (fa32629) to head (1dbe806).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/eas-cli/src/commands/worker/alias.ts	9.10%	14 Missing and 6 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2562      +/-   ##
==========================================
- Coverage   52.21%   52.19%   -0.02%     
==========================================
  Files         557      557              
  Lines       21021    21035      +14     
  Branches     4300     4304       +4     
==========================================
+ Hits        10975    10977       +2     
- Misses       9179     9187       +8     
- Partials      867      871       +4     

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