[v13.0.0-beta.2] aria-owns for dropdown and widget divs

[microbit-robert]

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Description

The main workspace needs to own the dropdown and widget divs. This will prevent the current behaviour of having the region change after interacting with a widget or dropdown div. This is worse than it used to be as the change results in the workspace region and aria-label being output again.

This requires ids for the dropdown and widget divs and aria owns set on the main workspace.

This requires a change to the aria.setState function that can currently take a list of strings as an argument and joins them with a comma. aria-owns expects a space-separate list, the current comma-separate list will not work.

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