fix: Immediately move vfolders to trash bin when purging user

[achimnol]

refs #2376

Move all vfolders when purging a user, instead of triggering immediate storage-level deletion.

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[achimnol]

• fix: Immediately move vfolders to trash bin when purging user #2405 👈 (View in Graphite)
• refactor: Remove the foreign key constraint of vfolders.{user,group} #2404
• main

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