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

Merged-In: Ic91d482593d6b978c28e3c6c0d19e2c055d5f149
Change-Id: Ic91d482593d6b978c28e3c6c0d19e2c055d5f149