fix: allow createRadio to remove element

[slash-init]

Resolves #9146

Changes:

• Updated createRadio().remove() so calling remove() without an argument removes the radio element itself.
• Added unit tests verifying removal from both the DOM and _elements.
• Added coverage for removeElements() removing radio elements.

PR Checklist

• npm run lint passes
• [Inline reference] is included / updated
• [Unit tests] are included / updated

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