Forward port of a50619200c6a08929dbe802118a6afadb376b866 to 9.1/master

Fix SMB backend registration

fixes size of the download spinner

Only show message in the UI when the checker is enabled

Add bzip2 to known mimetypes

Add a warning when the transaction isolation level is not READ_COMMITED

Allow opening the password reset link in a new window when its a URL

[decrypt_all] Check if file needs to decrypted or not for speed up large oc setups.

Add morrisjobke/webdav docker container for external storage tests

ownCloud as remote DAV always accepts the mtime on touch, but other
servers like Apache's DAV server doesn't. The latter doesn't give any
visible hint in its response to detect this case, so this fix does a
subsequent PROPFIND to check whether the mtime was actually set.

Since a touch() operation seldom happens (only on uploads), the minor
performance loss should hopefully be acceptable.

The trailing slash is needed when talking to Apache's mod_dav server

Add visual cue when moving draggable item over droppable item,

* Allow to lock a file without the lock being killed at the end of the request

* Make DB locking detectable

Adjust mail entries

Move DAV Tests to PSR-4

Move user_ldap to PSR-4