Support font_size and border_radius in classify/utilities

[kenyonj]

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Please read this description carefully. If you feel there is anything unclear or missing, please ask for updates.

What are you trying to accomplish?

This adds support to the Primer::Classify::Utilities class for converting class names like f3 and rounded-0 to the system args/values of font_size: 3 and border_radius: 0, respectively.

Integration

I don't believe so. Was there a reason that this wasn't added that causes conflicts?

List the issues that this change affects.

Closes # #2448

Risk Assessment

• Low risk the change is small, highly observable, and easily rolled back.
• Medium risk changes that are isolated, reduced in scope or could impact few users. The change will not impact library availability.
• High risk changes are those that could impact customers and SLOs, low or no test coverage, low observability, or slow to rollback.

What approach did you choose and why?

1. added a failing test to the utilities test file
2. added a new entry for the REPLACEMENT_KEYS hash constant that targeted f and radius class names
3. committed the results

Anything you want to highlight for special attention from reviewers?

Am I missing anything?

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Lookbook)
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge

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[changeset-bot]

🦋 Changeset detected

Latest commit: 6a441eb

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@primer/view-components	Minor

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