Add a direct call to `unminimizedTask` from `addOrMoveFreeformTaskToTop`...

Add a direct call to `unminimizedTask` from `addOrMoveFreeformTaskToTop` instead of each usage calling this method separately.

This makes it easier to refactor all the logic to task states in `DesktopModeTaskRepository` since classes like `FreeformTaskListener` do not need to know the implementation details of the task being minimized when a new task is added.

Change-Id: I9c409227ef221ece0106d14b686f7aaf7c1cda3b
Bug: 332682201
Flag: EXEMPT (no-op for functionality)
Test: atest DesktopModeTaskRepositoryTest