feat(radio-button): add validation props

[aledavila]

Closes #12643

Adds invalid warning and helperText to RadioGroup

Changelog

New

• adds new validation props to the RadioGroup

Testing / Reviewing

Make sure new props work as expected
Make sure readOnly always takes precedence over other validation props.

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[alisonjoseph]

LGTM! Unrelated to this issue, I did notice that the knobs for the regular story still work and not just the playground, not sure if we want to clean that up here or make a new issue?

[alisonjoseph]

Oops, just took a look at Percy and it seems that there is an extra space now below the radio button group. (yay VRT!)

[aledavila]

@alisonjoseph thanks. Yea I can clean that up in this PR. I'll check about the space.

[aledavila]

@alisonjoseph updated. ready for review

[andreancardona]

🔥 looks good!

[aagonzales]

The error icon should be using $support-error

The error message and icon are also misaligned