Adding support for cross-task hero transition

> Do not show starting window when using hero transition
> When running cross-task, only play the enter animation
> Allow transitions when using intent-sender

Bug: 113071278
Test: atest cts/tests/tests/transition/src/android/transition/cts/ActivityTransitionTest.java
atest cts/tests/tests/app.usage/src/android/app/usage/cts/ActivityTransitionTest.java

Change-Id: Id973d52412a9a2cde3ebcae3b718556c47dfff5d