SF: Use last commited vsync for the next vsync callback

Divides the vsync into lastVsync and committedVsync.
nextAnticipatedVsyncTimeFrom uses the committedVsync
for the lastVsyncOpt and avoids adjusting from the already adjusted
pendingCallbackVsyncTime when jank happens and timelines are adjusted.

BUG: 355049193
Test: atest libsurfaceflinger_unittest
Flag: EXEMPT bugfix
Change-Id: If246174be965ac70197d19af588c5cf5c4bdfccf