[eas-cli] Alias --build-id to --id in build:download

[brentvatne]

Why

Just a little useful shorthand, it makes sense to accept as just id given that we are operating on the build command here.

How

Alias it

Test Plan

easd build:download --id

[github-actions]

Subscribed to pull request

File Patterns	Mentions
**/*	@douglowder
packages/eas-cli/src/commands/build/**	@sjchmiela

Generated by CodeMention

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 55.83%. Comparing base (2279b65) to head (5f68449).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3656   +/-   ##
=======================================
  Coverage   55.83%   55.83%           
=======================================
  Files         864      864           
  Lines       37170    37170           
  Branches     7721     7721           
=======================================
  Hits        20751    20751           
  Misses      16323    16323           
  Partials       96       96           

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[github-actions]

✅ Thank you for adding the changelog entry!