Fix freeze issue after launch single app

Wrapping remote animation within options is not suitable for
starting shortcut/intent cases, it might lead to not performing
the remote animation due to an empty pid.

Handle remote animation of entering split screen as:
1. wct.startTask: Use activity option to adapt it.
2. wct.sendPendingIntent and wct.startShortcut: Use legacy
   transition to adapt it.

Fix: 271216878
Test: manual
Test: pass existing tests
Change-Id: I5c37135b004a459f31205d2f0c2e0d9c9aabcac4