Perform Activity#onStart when launching in LocalActivityManager.

We move to the start state when launching a tabbed activity through
LocalActivityManager, but currently do not inform the activity
thread due to changes in how ActivityThread is updated through the
ActivityLifecycler. This changelist addresses this issue.

Change-Id: Ibc2bda39617e1741bb3ee8637a182dc9f14dd61d
Fixes: 70813462
Fixes: 70812753
Test: atest CtsAppTestCases:android.app.cts.LifecycleTest
Test: atest LocalActivityManagerTest
Test: atest ActivityGroupTest