feat(Modal): add launcherButtonRef prop to handle focus on close

[tw15egan]

Closes #13680

Adds a new launcherButtonRef to Modal and ComposedModal. This allows a user to pass in a ref to the button that is used to launch the Modal

Changelog

New

• launcherButtonRef prop added to Modal / ComposedModal.

Changed

• Updated the state manager stories to use the new launcherButtonRef prop to handle focus returning to the button when the Modal / ComposedModal is closed

Testing / Reviewing

Ensure focus returns to the button when closing either Modal / ComposedModal via keyboard or mouse click

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[andreancardona]

Other than the AVT test failing - looks good. I wonder if we can just specify that test to get it to pass?

[tw15egan]

@andreancardona updated the tests to account for the new behavior

[tay1orjones]

Thanks for updating both Modal and ComposedModal 👍