Put back ESM helpers in a folder where we can use .js (#12919)

packages/babel-runtime-corejs2/helpers/iterableToArray.js

@@ -0,0 +1,12 @@
+var _Symbol = require("@babel/runtime-corejs2/core-js/symbol");
+
+var _isIterable = require("@babel/runtime-corejs2/core-js/is-iterable");
+
+var _Array$from = require("@babel/runtime-corejs2/core-js/array/from");
+
+function _iterableToArray(iter) {
+  if (typeof _Symbol !== "undefined" && _isIterable(Object(iter))) return _Array$from(iter);
+}
+
+module.exports = _iterableToArray;
+module.exports["default"] = module.exports, module.exports.__esModule = true;