test: check that fetch globals are disabled by default

PR-URL: nodejs#42015
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Mestery <mestery@protonmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Akhil Marsonya <akhil.marsonya27@gmail.com>

test/parallel/test-fetch-disabled.mjs

@@ -0,0 +1,9 @@
+import '../common/index.mjs';
+
+import assert from 'assert';
+
+assert.strictEqual(typeof globalThis.fetch, 'undefined');
+assert.strictEqual(typeof globalThis.FormData, 'undefined');
+assert.strictEqual(typeof globalThis.Headers, 'undefined');
+assert.strictEqual(typeof globalThis.Request, 'undefined');
+assert.strictEqual(typeof globalThis.Response, 'undefined');