Fix framerate propagation from child to parent layers

We were not resetting the framerate vote of the parent layer
after the child frame rate vote was removed. Fix this and
add tests to verify this behavior does not regress.

Flag: EXEMPT (removing old flags)
Bug: 330785038
Test: presubmit
Change-Id: I88d60484d4dfdfa4b09c98484867a49545f60257