[stable27] Truncate tables and rename documents folder on reset

[backportbot[bot]]

Backport of #5918

Warning, This backport's changes differ from the original and might be incomplete ⚠️

Todo

• [x] Review and resolve any conflicts

• [x] Amend HEAD commit to remove the line stating to skip CI

Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.

[mejo-]

Fixed the incomplete backport and did quick local testing of repair step, cronjob and occ text:reset.