test: allow adding known-globals through ENV

PR-URL: https://github.com/nodejs/node/pull/15187
Refs: https://youtrack.jetbrains.com/issue/WEB-27528
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Timothy Gu <timothygu99@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

test/common/index.js

@@ -412,6 +412,11 @@ if (global.Symbol) {
   knownGlobals.push(Symbol);
 }
 
+if (process.env.NODE_TEST_KNOWN_GLOBALS) {
+  const knownFromEnv = process.env.NODE_TEST_KNOWN_GLOBALS.split(',');
+  allowGlobals(...knownFromEnv);
+}
+
 function allowGlobals(...whitelist) {
   knownGlobals = knownGlobals.concat(whitelist);
 }