Skip importing ruleset-testing-core internally

Author: dagnir

.brazil.json

@@ -79,7 +79,8 @@
         "stability-tests": { "skipImport": true },
         "test-utils": { "skipImport": true },
         "tests-coverage-reporting": { "skipImport": true },
-        "third-party": { "skipImport": true }
+        "third-party": { "skipImport": true },
+        "ruleset-testing-core": { "skipImport": true }
     },
 
     "dependencies": {