Adding flag com.android.aconfig.flags.enable_only_new_storage to trunk_staging.

This change was automatically created by advancing the Gantry workflow at:
https://releasetracker.partner.android.com/changes/d1s1f9i000001?build_unique_id=Frontend:+android_platform_core_experiments_team_internal,+Study:+ComAndroidAconfigFlagsEnableOnlyNewStorageLaunch
Do not edit this file manually or revert this change - use the Gantry workflow to manage the state of this flag.

Bug: 312235596
Change-Id: I77cfb2b0d06b05fcf1bc2e7fb3dd9f393b52c154
Flag: com.android.aconfig.flags.enable_only_new_storage
Ignore-AOSP-First: AConfig change for future AOSP release
2 files changed