fix: add disabled attribute back to FormGroup

[wkeese]

Closes #17057

Add disabled attribute back to FormGroup.
Fixes regression from Carbon 11.

Changelog

New

• {{new thing}}

Changed

• FormGroup has disabled attribute again.

Removed

• {{removed thing}}

Testing / Reviewing

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[riddhybansal]

LGTM , JUST need to update snapshots to pass cli.

[wkeese]

Thanks, I pushed that change now.

[tay1orjones]

The story looks good, though it only includes a few components.

It's possible there are other components that may be styled off of a disabled prop/class and not styled off of :disabled. In that case the child component would need disabled, otherwise it wouldn't get proper disabled styling when this is placed on the wrapping FormGroup.

No need to hold up the merge though. If we uncover some components with this issue we can fix them at that time.

[carbon-automation]

Hey there! v11.63.0 was just released that references this issue/PR.