Add flag com.android.launcher3.model_repository to trunk_staging.

This change was automatically created by advancing the Gantry workflow at:
https://releasetracker.partner.android.com/changes/82hgn8q000001?build_unique_id=com.android.launcher3.model_repository-platform
Do not edit this file manually or revert this change - use the Gantry workflow to manage the state of this flag.

Bug: 390572144
Flag: com.android.launcher3.model_repository
Ignore-AOSP-First: AConfig change for future AOSP release
Change-Id: I83c5b7ceaeb8cf96e888bb25ea8eab1effc79d81
1 file changed