1/ Fix some issues with launching apps with trampoline tasks

- Skip collapsing a bubble when a new app-bubble task launch transition
  is observed, otherwise the collapse animation will conflict with the
  pending switch transition to the new task
- Defer to the normal TaskViewTransitions when there is a launch
  transition for a task that already exists as a bubble (instead of
  handling it as a part of the LaunchIntoOrConvertTransition)
- Fix an issue where we weren't finishing some transitions due to the
  default mixed transitions assuming that the playing bubble-launch
  transitions will always play and call the finish callback

Bug: 409394438
Flag: com.android.wm.shell.enable_bubble_anything
Test: Trigger Bubble on an app with a task->task trampoline
Change-Id: I6e05122ed1110534d56855f294af39faa06f38f6