Adding flag android.net.vcn.fix_config_garbage_collection to trunk_staging.

This change was automatically created by advancing the Gantry workflow at:
https://releasetracker.partner.android.com/changes/ecakcfi000001?build_unique_id=AndroidNetVcnFixConfigGarbageCollectionLaunch-platform
Do not edit this file manually or revert this change - use the Gantry workflow to manage the state of this flag.

Bug: 370862489
Change-Id: I4261b3afdc9ef175942e318077eb5eab2cfe4d58
Flag: android.net.vcn.fix_config_garbage_collection
Ignore-AOSP-First: AConfig change for future AOSP release
2 files changed