LDAP reset user option from UI

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Is your feature request related to a problem? Please describe.
You shouldn't be obligated to use occ commands to reset an LDAP user, especially for non sysadmin peoples administrating the Nextcloud.
If your LDAP has an old user with the same dn as a new one the database keep the old and don't mark as remnant making impossible to repair this with the administration interface and the new user is unable to connect.

Describe the solution you'd like
On the user list there should be a distinction between the delete option for remnants (that crash when it's not tag as remnant) and a reset one.

Describe alternatives you've considered
Fix the delete option for LDAP user to delete the user if is a remnant or reset it else wise.

The issue names no files, tests, or code entry points. Start by locating the administration user list and the LDAP user/remnant handling, then trace how deletion currently behaves for stale LDAP entries. Done means administrators can distinguish reset from remnant deletion, repair the described duplicate-DN case through the UI, and have coverage for both paths.