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Fix PiP transition ordering
First, this cancels the existing pip animation if it is told to exit. Without this, an exit animation that starts before an enter animation finishes will have its state clobbered by the exit's finishTransition call. Next, make pip-enter transitions queue-up so that they don't interleave before other queued transitions (very common during CTS). Bug: 231150615 Test: atest PinnedStackTests Change-Id: I7f162c0b1f24ab845770b805c8fae2252814945e