zooniverse / Panoptes-Front-End / 10164

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Fix 5527: prevent double annotations on touchscreen marking tasks (#5528)

* Check for PointerEvent before assigning event handlers

* Revert changes to e.preventDefault

* Update Draggable Tests to accommodate window.PointerEvent existing, or not existing

* Add tests for pointer support (#5529)

* Add tests for pointer support
Split testDrag() into testDragEnabled() and testDragDisabled() then add tests for drag with and without pointer event support.

* Beef up tests
Remove global variables that accidentally share values across tests.
Test drag and end when events are disabled.

* Add a usePointer prop for tests
Add a usePointer prop, which defaults to !!window.PointerEvent in the browser.

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