Fix MixedProfileOwnerTest#testLockTask_emergencyDialer failure

Whitelisted package was unable to be started in lock task mode.
We should still perform the lock task violation check if creating
a new task is necessary, instead of refuse the launch directly,
and do it once the new task is created.

Bug: 140908643
Bug: 139449647
Test: atest MixedProfileOwnerTest#testLockTask_emergencyDialer
Test: atest ActivityStarterTests
Change-Id: I3d2516f65708d172d32cf3f3f26d55542247530e