revert: Revert "fix: Restore legacy test util selectors for Radio Group (#4058)"

[jperals]

This reverts commit 4950e94.

These backwards-compatible selectors have been in the code for 4 weeks months, we should now be able to clean them up.

The :is pseudo-selectors affects consumer with old testing dependencies.

Doc: zOhkAQWpDXKq

Description

Related links, issue #, if available: n/a

How has this been tested?

Existing tests

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 97.45%. Comparing base (a3d7548) to head (fddfb96).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4117      +/-   ##
==========================================
- Coverage   97.45%   97.45%   -0.01%     
==========================================
  Files         901      901              
  Lines       26450    26447       -3     
  Branches     9530     9530              
==========================================
- Hits        25776    25773       -3     
  Misses        631      631              
  Partials       43       43              

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