Add flag com.android.documentsui.flags.visual_signals_ro to trunk_staging.

This change was automatically created by advancing the Gantry workflow at:
https://releasetracker.partner.android.com/changes/3h6hh3a000001?build_unique_id=android_platform_documentsui
Do not edit this file manually or revert this change - use the Gantry workflow to manage the state of this flag.

Bug: 401974530
Flag: com.android.documentsui.flags.visual_signals_ro
Ignore-AOSP-First: AConfig change for future AOSP release
Change-Id: I53a06e35cb0717b59b6ec0835b62e01d05d3df86
1 file changed