Adding flag com.android.server.am.limit_priority_scope to trunk_staging.

This change was automatically created by advancing the Gantry workflow at:
https://releasetracker.partner.android.com/changes/ff5c80a000001?build_unique_id=android_platform_backstage_power
Do not edit this file manually or revert this change - use the Gantry workflow to manage the state of this flag.

Bug: 369487976
Change-Id: Ie1e5b69e2898044761980b6ebbac2f2bf968e81c
Flag: com.android.server.am.limit_priority_scope
Ignore-AOSP-First: AConfig change for future AOSP release