Add CUJ-LAUNCHER_OPEN_ALL_APPS instrumentation from taskbar

Added instrumentation when allapps is opened by button click in the
taskbar. Starting the slice in the onClickListener of the allApps button
and ending it on the end of the animation.

Test: checked the trace
Fixes: b/270128563
Flag: None
Change-Id: I492a4a7af81e0c40dc3d7d415ffc7b16c057b25d