fix: fix user manager refcount on startup (#16632) (#16634)

Signed-off-by: xxchan <[email protected]>
Co-authored-by: xxchan <[email protected]>

src/meta/src/manager/catalog/user.rs

@@ -67,6 +67,13 @@ impl UserManager {
                     .map(|table| table.owner),
             )
             .chain(database.views.values().map(|view| view.owner))
+            .chain(database.functions.values().map(|function| function.owner))
+            .chain(
+                database
+                    .connections
+                    .values()
+                    .map(|connection| connection.owner),
+            )
             .for_each(|owner_id| user_manager.increase_ref(owner_id));
 
         Ok(user_manager)