MM-58253 Ensure remotes can only update users belonging to them (#27290)

* - ensure new users get correct remoteID
- ensure remotes can only update users belonging to them
- ensure user remoteIDs cannot be changed once set

* make modules-tidy

---------

Co-authored-by: Mattermost Build <build@mattermost.com>

server/go.mod

@@ -42,7 +42,7 @@ require (
 	github.com/mattermost/gosaml2 v0.8.0
 	github.com/mattermost/ldap v0.0.0-20231116144001-0f480c025956
 	github.com/mattermost/logr/v2 v2.0.21
-	github.com/mattermost/mattermost/server/public v0.1.0
+	github.com/mattermost/mattermost/server/public v0.1.4
 	github.com/mattermost/morph v1.1.0
 	github.com/mattermost/rsc v0.0.0-20160330161541-bbaefb05eaa0
 	github.com/mattermost/squirrel v0.4.0