Add KEYGUARD_OCCLUDING flag/startTask to WAKE transition

This fixes an issue were if the device wakes and a freeform task opens
over the unlocked keyguard at the same time, the OPEN task change may be
included into the TRANSIT_WAKE transition that was not handled by the
KeyguardTransitionHandler, which prevented it from being dismissed out
of freeform mode into fullscreen mode.

This change adds the KEYGUARD_OCCLUDING flag to the wake transition, so
that the KeyguardTransitionHandler is able to handle the animation.

Bug: 329916266
Bug: 326384071
Bug: 310307979
Test: atest ActivityVisibilityTests#testFreeformWindowToTurnScreenOn
--rerun-until-failure (no failures in 200+ attempts)

Change-Id: Ia33852c77678e2596bb88fd4dcca72b451466510