fix: pgsql user waiter

stackit/internal/services/sqlserverflexbeta/user/planModifiers.yaml

@@ -3,16 +3,13 @@ fields:
     modifiers:
       - 'UseStateForUnknown'
 
-  - name: 'user_id'
-    modifiers:
-      - 'UseStateForUnknown'
-
   - name: 'instance_id'
     validators:
       - validate.NoSeparator
       - validate.UUID
     modifiers:
       - 'UseStateForUnknown'
+      - 'RequiresReplace'
 
   - name: 'project_id'
     validators:
@@ -28,6 +25,7 @@ fields:
 
   - name: 'user_id'
     modifiers:
+      - 'UseStateForUnknown'
       - 'RequiresReplace'
 
   - name: 'username'