User limit enforcement (#26511)

* Added hard limits when creating user

* Added check to user activation

* Added missing check for licensed servers

* Fix i18n

* Fixed style order

* Added a separate hard limit along with existing 10k user soft limit

* For CI

* Fixing flaky test, hopefully

* Added tests

server/channels/api4/user.go

@@ -1561,6 +1561,7 @@ func updateUserActive(c *Context, w http.ResponseWriter, r *http.Request) {
 
 	if _, err = c.App.UpdateActive(c.AppContext, user, active); err != nil {
 		c.Err = err
+		return
 	}
 
 	auditRec.Success()