Adding flag com.android.aconfig_new_storage.enable_aconfigd_from_mainline to trunk_staging.

This change was automatically created by advancing the Gantry workflow at:
https://releasetracker.partner.android.com/changes/a2sgpoa000001?build_unique_id=android_platform_core_experiments_team_internal
Do not edit this file manually or revert this change - use the Gantry workflow to manage the state of this flag.

Bug: 369808805
Change-Id: Idf755cba92a749abd2229897ab3f5a6e1bf392ca
Flag: com.android.aconfig_new_storage.enable_aconfigd_from_mainline
Ignore-AOSP-First: AConfig change for future AOSP release
1 file changed