[eas-cli] Add --system-image to eas simulator:start

[krystofwoldrich]

Summary

• Add --system-image to select the Android SDK system image for a simulator session.
• Trim the supplied value, omit blank values, and reject the flag for iOS.
• Cover forwarding it alone and alongside --device with command tests.

Testing

• Added command tests for Android forwarding, combined device options, blank values, and iOS rejection.

[github-actions]

✅ Thank you for adding the changelog entry!

[github-actions]

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File Patterns	Mentions
packages/eas-cli/**	@douglowder

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.75%. Comparing base (862d0a8) to head (7dabd27).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4500      +/-   ##
==========================================
+ Coverage   72.74%   72.75%   +0.01%     
==========================================
  Files         980      980              
  Lines       47045    47052       +7     
  Branches    10169    10175       +6     
==========================================
+ Hits        34219    34226       +7     
  Misses      11830    11830              
  Partials      996      996              

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[gwdp]

Missing PR

[douglowder]

eas-cli now uses changesets for changelogs (#4580). The required "Check for a changeset" check fails on PRs that edit CHANGELOG.md.

To update this PR:

1. Revert the changes to CHANGELOG.md.
2. Run yarn changeset, select the changed packages and the bump type, and write the summary.
3. Commit the new file in .changeset/.

The release adds the PR link and the author to the entry. If this PR needs no changelog entry, revert the CHANGELOG.md changes and add the "no changelog" label.