Fix user's ability to scroll menu with sections (#5513)
* Allow user to scroll nested scroll regions like menu sections in popovers
we were previously blocking scrolling if the scroll region the user touched didnt have overflow, but that was triggering for menu sections because the section is techincally scrollable but it doesnt have any overflow
* add option to getScrollParent to check if the scroll parent is actually scrollable
happy middle ground so we can get this check in other places in our code base without turning it on automatically
