RESTRICT AUTOMERGE Ignore pinned Windows

Pinned windows (e.g. PIP windows) should not enable BAL.

Test: atest BackgroundActivityLaunchTest
Flag: EXEMPT security fix
Bug: 406880479
Cherrypick-From: https://googleplex-android-review.googlesource.com/q/commit:fc5dc86b6b79ca43758ca337f7ef858009acdc9d
Merged-In: I7ef4eb7123de24815703f4cc36cd192b6bca9517
Change-Id: I7ef4eb7123de24815703f4cc36cd192b6bca9517
5 files changed