Move freeze trigger into processFreeze method

...becuase video pause case is well handled by #processFreeze.

  - Delete traceMaxFreezeDurationMs that was to filter video pause.
  - Don't hold the lock while triggering the trace function.

Bug: 306066408
Test: atest VideoRenderQualityTrackerTest
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:88c16dda0546c920eabc4fdb170375b6eba5c355)
Merged-In: I7a8ef9af7246160592967c30932e061c95bda1a8
Change-Id: I7a8ef9af7246160592967c30932e061c95bda1a8