Adding NodeJS version 12 env (#1683)

Co-authored-by: Rahul Bhati <rjbhati009@gmail.com>

test/tests/test_environments/node_src/test-case-1/helloWorld.js

@@ -0,0 +1,6 @@
+module.exports = async function (context) {
+  return {
+    status: 200,
+    body: "hello, world!\n",
+  };
+};