Apply temporary PiP decor separately from overall placement

This change moves temporary decor handling out of the KeepClearAlgorithm
as it does not factor into keep clear area avoidance, and separating it
allows us to animate out the edu text without re-calculating the overall
PiP position. The PiP does not move immediately in response to keep
clear area changes, as it waits for the PiP position to stabilize - but
changes to temporary decor, such as edu text, should still be applied
immediately.

Bug: 226583836
Test: test TvPipBoundsControllerTest TvPipKeepClearAlgorithmTest
Change-Id: I49d32c18af13978a8a31b9a573273905fce934fd