RESTRICT AUTOMERGE Ignore pinned Windows (Consolidated fix)

ag/32704936
ag/35782210
ag/36195227
ag/36359572

Bug: 439984935
Test: atest BackgroundActivityLaunchTest
Flag: EXEMPT BUGFIX
Cherrypick-From: https://googleplex-android-review.googlesource.com/q/commit:d7e9d1e8b8fd3202dfc8a91772ae7c7d1e88e2c8
Merged-In: I9ce93366a0876c7bc594ef818c8598342d70513d
Change-Id: I9ce93366a0876c7bc594ef818c8598342d70513d