Pause the prediction update until the app launch transition ends.

b/319162661 issue is similar to hotseat updates on app click : b/148800229 and ag/10235572

So we will pause the prediction updates until the app launch transition is complete.

See https://b.corp.google.com/issues/319162661#comment9 and https://b.corp.google.com/issues/319162661#comment10 for bug report
analysis.

Before fix: https://b.corp.google.com/issues/319162661#comment11

After fix: https://b.corp.google.com/issues/319162661#comment12

Bug: 319162661
Test: Manual
Flag: NA
Change-Id: I797ce982569c7950628368b854fb3b6766f0fc28