Add option to jest to run tests only locally, or on linux (#2609)

Summary:
Pull Request resolved: https://github.com/facebook/flipper/pull/2609

Make it possible to mark some tests to run on non-CI, or unix only

Reviewed By: nikoant

Differential Revision: D29813506

fbshipit-source-id: 140f8a4eaed5af3282ab9d139b46a52818be0934

desktop/app/src/utils/__tests__/sideEffect.node.tsx

@@ -59,8 +59,7 @@ describe('sideeffect', () => {
     console.error = origError;
   });
 
-  // TODO(T93353978): Re-enable.
-  test.skip('can run a basic effect', async () => {
+  test.local('can run a basic effect', async () => {
     unsubscribe = sideEffect(
       store,
       {name: 'test', throttleMs: 1},