Defer resuming activity while applying WCT

The WCT ought to be an atomic operation, so it should make sense
to defer the activity resuming while processing the ops.

If the activity has to be relaunched while applying the WCT,
still relaunching it to the RESUMED state if it is currently in
the RESUMED state.

Bug: 345189844
Test: atest ActivityLifecycleFreeformTests
Change-Id: I7c47d3210081c22820da850d84e304952bc66875