[eas-cli] Add -p alias for --platform in simulator:start

[brentvatne]

Why

eas simulator:start required the full --platform flag, while most other EAS CLI commands (build, submit, update, etc.) accept -p as a shorthand. This adds the same shorthand for consistency.

How

Added char: 'p' to the platform flag definition in simulator/start.ts, matching the convention used across the rest of the CLI.

Test Plan

$ eas simulator:start --help
USAGE
  $ eas simulator:start -p android|ios [...]

FLAGS
  -p, --platform=<option>  (required) Device platform
                           <options: android|ios>

🤖 Generated with Claude Code

[github-actions]

✅ Thank you for adding the changelog entry!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.03%. Comparing base (99fba8c) to head (a24f16b).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3902   +/-   ##
=======================================
  Coverage   59.03%   59.03%           
=======================================
  Files         935      935           
  Lines       40931    40931           
  Branches     8622     8622           
=======================================
  Hits        24158    24158           
  Misses      16677    16677           
  Partials       96       96           

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[brentvatne]

no idea why codemention is failing here

[szdziedzic]

Awesome