[native] Refactor background opacity to reanimated 2

Summary:
issue: ENG-8914
This changes the animation of the backgroud

Test Plan:
Tested with following diffs (this is with longer duration, so that the animation can be seen better):

Reviewers: tomek, will

Reviewed By: tomek

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D13066