Add flag com.android.tradeinmode.flags.trade_in_mode_2025q4 to trunk_staging. This change was automatically created by advancing the Gantry workflow at: https://releasetracker.partner.android.com/changes/6mnkk7a000001?build_unique_id=android_platform_phoenix Do not edit this file manually or revert this change - use the Gantry workflow to manage the state of this flag. Bug: 397154502 Flag: com.android.tradeinmode.flags.trade_in_mode_2025q4 Ignore-AOSP-First: AConfig change for future AOSP release Change-Id: I9690d23c4abd0be272031a72172f3a0322288ce1