Fix axe checks for RadioButton and CheckBox previews

[camertron]

What are you trying to accomplish?

In a recent PR, we exempted the RadioButton and CheckBox previews from axe checking because of a few failures that occurred after upgrading our accessibility checking tools. This PR addresses the issues and re-enables axe checking for these previews.

Integration

No changes necessary in prod.

List the issues that this change affects.

Fixes https://github.com/github/primer/issues/2786

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.

Accessibility

• Fixes axe scan violation - This change fixes an existing axe scan violation.

Merge checklist

- [ ] Added/updated tests
- [ ] Added/updated documentation
- [ ] Added/updated previews (Lookbook)
- [ ] Tested in Chrome
- [ ] Tested in Firefox
- [ ] Tested in Safari
- [ ] Tested in Edge

[changeset-bot]

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Latest commit: d988bf6

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