feat: Add info variant to Icon

[ywyyu17]

Description

Adds an info color variant to the Icon component, mapped to the existing colorTextStatusInfo design token.

The change is additive and backward compatible. Nothing renders differently unless a consumer explicitly sets variant="info", and the colorTextStatusInfo token is already defined in different themes, so there is no theme-specific work and no migration required.

How has this been tested?

• Regenerated and verified the documenter API snapshot (single-line info addition).
• Verified the change is backward compatible — existing variants render unchanged.

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.66%. Comparing base (3e7a10c) to head (8155182).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4946   +/-   ##
=======================================
  Coverage   97.66%   97.66%           
=======================================
  Files         959      959           
  Lines       31342    31342           
  Branches    11578    11578           
=======================================
  Hits        30610    30610           
  Misses        686      686           
  Partials       46       46           

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[at-susie]

Do you wanna add any example page for this new variant? Otherwise, we cannot screenshot-test this variant.

[ywyyu17]

Added it, thank you so much @at-susie!