feat: restore focus on the canvas when pop up is closed

[jarekdanielak]

Proposed Changes

Related to camunda/camunda-modeler#4620
Related to https://github.com/bpmn-io/internal-docs/issues/1081

Utilize new Canvas#restoreFocus API to restore focus on the canvas after the pop up closes.

Checklist

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• Brief textual description of the changes present
• Visual demo attached
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[nikku]

I think this is not needed, as the chooser is a popup editor (core diagram concern). Popups should already integrate natively with the new diagram focus behavior.

[jarekdanielak]

Correct. Works out of the box with new diagram-js. Closing this one.