Add coroutine names for tracing

Also, shutoff ClockEventController registrations from clock
switch when flag is on. This was noticed in the traces.

Bug: 331748021
Test: Take traces
Flag: ACONFIG com.android.systemui.migrate_clocks_to_blueprint
TEAMFOOD

Change-Id: If25d3a0e04aa0b73a4db29139da6f34814163835