feat(transform_conformance): custom reporter for exec test (#7715)

closes #7704

tasks/transform_conformance/reporter.mjs

@@ -0,0 +1,21 @@
+import { JsonReporter } from 'vitest/reporters';
+
+export default class CustomReporter extends JsonReporter {
+  async writeReport(report) {
+    const json = JSON.parse(report);
+    console.log();
+    for (const testResult of json.testResults) {
+      if (testResult.status !== 'failed') {
+        continue;
+      }
+      const message = testResult.message;
+      if (!message) {
+        continue;
+      }
+      const name = testResult.name.replace(import.meta.dirname, '.');
+      console.log(name);
+      console.log(message);
+      console.log();
+    }
+  }
+}