feat(composed-modal): pass ref to ComposedModal and parts

[kevinsperrine]

Closes #10543

A simple PR to add refs to the ComposedModal, ModalHeader, ModalBody, and ModalFooter components. We have a need to measure the content and automatically adjust the size of the modal based on the available space and the used space. This simplifies that process significantly.

Changelog

New

• add forwardedRef prop to ComposedModal
• add forwardedRef prop to ModalHeader
• add forwardedRef prop to ModalFooter
• • These prop was not added to propTypes, so it doesn't have to be deprecated in v11 when switching to function props
• added React.forwardRef to ModalBody
• added React.forwardRef to next/ModalBody
• added React.forwardRef to next/ModalHeader
• added React.forwardRef to next/ModalFooter
• added tests to confirm refs are properly forwarded and set

Testing / Reviewing

Confirm the unit tests are sufficient to confirm ref are passed and working

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[tay1orjones]

Looks good 👍 Thanks for mirroring the changes in next for v11!