Changes page alignment in PagedView calcualtion

- Align pages to right (instead of left) in RTL, to make scroll calculation for grid overview easier for out of orientation tasks
- Changed TaskView pivot direction to be consistent with page alignment
- Add scroll offset for ClearAllButton to align to left in RTL
- Fixed Workspace scroll issues in RTL, and removed needs to use panelCount when calculating page scroll

Bug: 175939487
Test: Test carousel/grid overveiw, Workspace, Folder scroll view for normal/RTL
Change-Id: Ic0ba88e5d58638e1149d97a68a978d80fbf26774