fix(Menu): update drilldown transition event handler #10839
Merged
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What: Closes #10840
Updates the logic for Menu to only include the drilldown transition handler when the Menu is a drilldown (after transitions were added in core to the base Menu, this event handler was firing for all Menus instead of only Drilldowns).
Updates the logic in Dropdown/Select/MenuContainer to focus the first item on an isOpen change rather than in the click handler.
Adds
shouldFocusFirstItemOnOpen
to MenuContainer for parity.