fix(ComposedModal): close modal with esc key when no element has focus

[tw15egan]

Closes #10193

After doing a bit of digging between Modal and ComposedModal it seems like the div needs a tabIndex in order for onKeyDown events to fire.

Changelog

Changed

• Added a tabIndex to the outer ComposedModal div so that all keypress events are captured

Testing / Reviewing

Open ComposedModal with State Manager example. Open the Modal, click on the text (to lose focus from the input), and try closing the modal with the esc key

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[jnm2377]

Sorry for the late review! It's working as expected for me! 🔥