feat(overlay): allow for scroll strategy to be swapped out #15067
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With #12306 we added the ability to swap out position strategies, however that won't be enough to handle all use cases since the consumer is still locked into the scroll strategy that they chose at the start. E.g. when switching an overlay from a dialog to a dropdown, it might not make sense to block scrolling anymore. These changes add an API to allow for the scroll strategy to be swapped.