Revert^2 "SF: Introduce VsyncTimeline to VsyncPredictor"

Add the concept of timeline freezing when switching render rate.
This allow us to change render rates in sync with the app and remain
jank free across render rate changes.

Bug: 326599221
Test: Run TouchLatency, change render rate and examine Perfetto trace

Change-Id: Ic91d482593d6b978c28e3c6c0d19e2c055d5f149