Update KQS recents apps and desktop mode launching UX

- Updated recent apps KQS task view
- Added a desktop mode KQS task view
- Did some code cleanup to support this more cleanly

Flag: EXEMPT ENABLE_KEYBOARD_QUICK_SWITCH
Fixes: 357512178
Test: Used KQS with and without desktop mode; opened recent apps and desktop mode
Change-Id: Ib47a8a7f41b56af1ba9d0cbec65ababf8aad7881