Instead of throwing an error just return an empty list. Since that is
actually what it is.

Fixes #19789

1. Allows it to use the more secure CSP rules of the AppFramework.
2. Adds some unit tests.

WebDAVFS as used by Finder requires a Class 2 compatible WebDAV server. This change introduces a fake locking provider which will simply advertise Locking support when a request originates from WebDAVFS. It will also return successful LOCK and UNLOCK responses.

* Fix existing unit tests

The string "More than 1,000 directory entries available." would mean only 1 entry, in english it should be 1,000 . Found it while translating

Forcing the approval of app permissions makes sure that the GDrive API
will always return a refresh_token.

In the case of apps that were already authorized for the current user/domain,
the API doesn't return the refresh_token which causes expiration issues.