ToggleGroupControl: Remove invalid props from types

[mirka]

Extracted from #44168

What?

• From the ToggleGroupControl prop types, removes the label and disabled props picked from the FormElementProps type.
• Removes the FormElementProps utility type altogether.

Why?

• FormElementProps[ 'label' ] was marked as optional, and was overriding the explicitly required label prop defined in ToggleGroupControlProps itself.
• ToggleGroupControl does not properly support a disabled prop in its current form.

The FormElementProps is kind of unnecessary at the moment, so I think we should remove it for now.

Testing Instructions

npm run storybook:dev and see the props table for ToggleGroupControl. The disabled prop should be gone, and the label prop should now be correctly marked as required.

[codesandbox]

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[ciampo]

It's actually the first time that I see the FormElementProps type!

Anyway, nice finding! 🚀