[eas-cli] Add environment flag to deploy script

[kadikraman]

Why

The --environment flag was getting sanitised out of the flags so it was always undefined.

How

Added the environment flag to sanitizeFlags.
Also switched to using the shared EASEnvironmentFlag which does additional validation and transforms the flag to uppercase.

Test Plan

Tested locally that easd deploy --environment production includes env vars in api routes.

[github-actions]

Subscribed to pull request

File Patterns	Mentions
**/*	@szdziedzic, @khamilowicz, @sjchmiela, @radoslawkrzemien

Generated by CodeMention

[github-actions]

Size Change: +1.5 kB (0%)

Total Size: 53.4 MB

Filename	Size	Change
./packages/eas-cli/dist/eas-linux-x64.tar.gz	53.4 MB	+1.5 kB (0%)

_{compressed-size-action}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.50%. Comparing base (17661d1) to head (bfd7444).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2763   +/-   ##
=======================================
  Coverage   52.50%   52.50%           
=======================================
  Files         583      583           
  Lines       22583    22583           
  Branches     4449     4449           
=======================================
  Hits        11854    11854           
  Misses      10694    10694           
  Partials       35       35           

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[github-actions]

✅ Thank you for adding the changelog entry!