fix: make ignore behave it does in prisma with no index models

Author: svetch

packages/language/src/validators/datamodel-validator.ts

@@ -48,12 +48,14 @@ export default class DataModelValidator implements AstValidator<DataModel> {
         const uniqueFields = allFields.filter((f) => f.attributes.find((attr) => attr.decl.ref?.name === '@unique'));
         const modelLevelIds = getModelIdFields(dm);
         const modelUniqueFields = getModelUniqueFields(dm);
+        const ignore = hasAttribute(dm, '@@ignore');
 
         if (
             idFields.length === 0 &&
             modelLevelIds.length === 0 &&
             uniqueFields.length === 0 &&
-            modelUniqueFields.length === 0
+            modelUniqueFields.length === 0 &&
+            !ignore
         ) {
             accept(
                 'error',