[Feature]: Add 'disabled invalid forms' to button group buttons

[CWatson-Tactile]

Is there an existing issue for this?

• I have searched the existing issues

Summary

A standard button widget has a toggle to disable the button if the form it is inside is invalid.
This is not an option for button groups.

Standard Button Widget

Button Group Widget

Why should this be worked on?

Adding this option would improve feature parity between button groups and buttons.
It would also prevent confusion for users/developers.

I use button groups often because it is easier to add / remove buttons without moving UI elements around.

I have to redo a bunch of forms now because I was unaware there was a difference between button groups and buttons.