Fix missing creator token error

GameSession calls startActivityFromGameSession with a trampolineIntent
that contains the final intent to be launched. But it does not go
through prepareToLeaveProcess; thus extra intent keys are not
collected. It also does not go through addCreatorToken on the
server side.

Bug: 376861334
Test: Manual test.
Flag: android.security.prevent_intent_redirect
Change-Id: I4fd72b06e075458058e1a1527261ce9d06d70715