Fix talkback issues in edit mode

- Set a label to the removal badge
- Remove duplicate content descriptions on tiles
- Move the available tiles clickable modifier up to the parent to encapsulate the labels

Test: manually using Talkback
Flag: com.android.systemui.qs_ui_refactor_compose_fragment
Fixes: 406826901
Fixes: 396177516
Change-Id: If7328951da9bb8ce4c288f41977b693e3b43a4fc