Removing state from TISBinder

Making OverviewComponentObserver a singleton

Bug: 384896306
Bug: 337863494
Test: Presubmit
Flag: EXEMPT bugfix
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:64dcfcf0c75c3c238735cc1e9100a8b78eae9941)
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:bb358e2342bbdf5cce6e0afcc945852b33dde32c)
Merged-In: Ic7805ee4f4eef25098ddec4025062135d03c1611
Change-Id: Ic7805ee4f4eef25098ddec4025062135d03c1611