test_runner: remove no-op validation

The code already checks if testNamePatterns is an
array, and converts it to an array if it is not.

PR-URL: nodejs#47687
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Moshe Atlow <moshe@atlow.co.il>
Reviewed-By: Debadree Chatterjee <debadree333@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Deokjin Kim <deokjin81.kim@gmail.com>

lib/internal/test_runner/runner.js

@@ -391,7 +391,7 @@ function run(options) {
     if (!ArrayIsArray(testNamePatterns)) {
       testNamePatterns = [testNamePatterns];
     }
-    validateArray(testNamePatterns, 'options.testNamePatterns');
+
     testNamePatterns = ArrayPrototypeMap(testNamePatterns, (value, i) => {
       if (isRegExp(value)) {
         return value;