Show output of panic found when updating fourslash tests and run them with -v so we can diagnose which test is failing

Author: sheetalkamat

internal/fourslash/_scripts/updateFailing.mts

@@ -13,15 +13,15 @@ function main() {
     const go = which.sync("go");
     let testOutput: string;
     try {
-        testOutput = cp.execFileSync(go, ["test", "./internal/fourslash/tests/gen"], { encoding: "utf-8" });
+        testOutput = cp.execFileSync(go, ["test", "-v", "./internal/fourslash/tests/gen"], { encoding: "utf-8" });
     }
     catch (error) {
         testOutput = (error as { stdout: string; }).stdout as string;
     }
     const panicRegex = /^panic/m;
     if (panicRegex.test(testOutput)) {
         fs.writeFileSync(failingTestsPath, oldFailingTests, "utf-8");
-        throw new Error("Unrecovered panic detected in tests");
+        throw new Error("Unrecovered panic detected in tests\n" + testOutput);
     }
     const failRegex = /--- FAIL: ([\S]+)/gm;
     const failingTests: string[] = [];