fix(ui): replace misleading permission tooltip on segment override variations (#7011)

Author: nielskaspers

frontend/web/components/mv/VariationValueInput.tsx

@@ -37,7 +37,11 @@ export const VariationValueInput: React.FC<VariationValueProps> = ({
             <>
               {Utils.renderWithPermission(
                 canCreateFeature,
-                Constants.projectPermissions(ProjectPermission.CREATE_FEATURE),
+                readOnly
+                  ? 'Variation values are defined at the feature level and cannot be changed per segment.'
+                  : Constants.projectPermissions(
+                      ProjectPermission.CREATE_FEATURE,
+                    ),
                 <ValueEditor
                   data-test={`featureVariationValue${
                     Utils.featureStateToValue(value) || index