[6/n] Camera Compat UI: Dispatch pending events in task organiser to ensure state update in UI.

Without this change, Task#dispatchTaskInfoChangedIfNeeded led to a pending task event being added in TaskOrganizerController#onTaskInfoChanged but not dispatched which sometimes resulted in the stale state for the camera compat control.

Test: manual - no stale state.
Bug: 214429446
Change-Id: Ief8891b938ec6116fd3adbc260d3457817ba2e02