Create task record with window container controller when adding task

- Call through the stack to create the task record completely instead of
  creating the record directly when adding a new task. If adding the task
  fails, also remove the task from the stack
- Remove unused caching members (they were never set) optimization when
  adding tasks

Bug: 73898704
Test: Manual, install APK from bug, and start up to ensure that SysUI
      does not crash

Change-Id: I5ef778e6e8ff90c225dadcf8494de5e09798bd8b