Ensure Select onScroll is bound to the Popover, not the listbox

[acelaya]

This PR fixes a regression that was likely introduced when the Popover component was implemented.

That made the Select's onListboxScroll to never be invoked again, as due to the new DOM structure, the element that ends up with scroll is not the listbox, but the popover itself.

This PR deprecates onListboxScroll, and adds a new onPopoverScroll prop to replace it (its default value is whatever was passed to onListboxScroll, for backwards compatibility), and also makes sure the onPopoverScroll is passed to the right DOM element.

This PR is part of https://github.com/hypothesis/support/issues/178

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (edf6957) to head (629ce95).
Report is 1 commits behind head on main.

Additional details and impacted files

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##              main     #1864   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files           70        70           
  Lines         1306      1307    +1     
  Branches       482       483    +1     
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+ Hits          1306      1307    +1     

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[acelaya]

The overflowing and height controls are on the Popover now, so that's the element where we should listen for onScroll.