[Media] Fixes swipe to dismiss in RTL.

SwipeToDismiss reimplemented more simply with a nestedDraggable,
informed by the SwipeToReveal implementation.

Bug: 403558944
Test: manually verified in the Compose Gallery app that the
dismissible media card carousel, in RTL, can be dismissed correctly. Also made sure that the LTR case isn't harmed
Flag: EXEMPT code not yet used in production

Change-Id: Ibd3839d5d8981006723c1cd38cf678d5fe608768