Fix bubble user education if bubble is on the right (part 1)

When the user education is shown:
* The bubble stack stays on the pinned side of the screen.
* The bubble stack animates into the correct position.
* The stack user education is presented on the current side of the screen in both LTR and RTL locales.

Bug: 302520752
Test: manual
Flag: none
Change-Id: I0ff6e12759473011ee7ac51ab184dbdef254c1da