Warn when console.error is used in tests

Summary:
It's a bit hacky but apparently the recommended solution:
https://stackoverflow.com/questions/28615293/is-there-a-jest-config-that-will-fail-tests-on-console-warn

This will bail when a call to `console.error` is used in a test.
If you *need to* use console.error in a test, then mock it.

This will likely not pass yet, but let's fix all failures and then land it.

Reviewed By: danielbuechele

Differential Revision: D13898383

fbshipit-source-id: 0ca222a07433a9a311dc6bdf0d264342a59208be

static/globalTestSetup.js

@@ -0,0 +1,14 @@
+/**
+ * Copyright 2018-present Facebook.
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ * @format
+ */
+const defaultConsoleError = console.error;
+
+console.error = function(message) {
+  defaultConsoleError(
+    'console.error used in a test. This will be an error in the near future.',
+  );
+  defaultConsoleError.apply(console, arguments);
+};