Save initial signup information for users to aid in spam prevention (#31852)

This will allow instance admins to view signup pattern patterns for
public instances. It is modelled after discourse, mastodon, and
MediaWiki's approaches.

Note: This has privacy implications, but as the above-stated open-source
projects take this approach, especially MediaWiki, which I have no doubt
looked into this thoroughly, it is likely okay for us, too. However, I
would be appreciative of any feedback on how this could be improved.

---------

Co-authored-by: Giteabot <teabot@gitea.io>

services/auth/source/ldap/source_authenticate.go

@@ -89,7 +89,7 @@ func (source *Source) Authenticate(ctx context.Context, user *user_model.User, u
 			IsActive:     optional.Some(true),
 		}
 
-		err := user_model.CreateUser(ctx, user, overwriteDefault)
+		err := user_model.CreateUser(ctx, user, &user_model.Meta{}, overwriteDefault)
 		if err != nil {
 			return user, err
 		}