Summary:
Consolidate JavaScript tests from open source into a single script that can be executed by both Circle CI and Sandcastle, the internal Facebook CI.
[General] [Changed] - Switch internal and external CI to use the same script when running JavaScript tests
Pull Request resolved: https://github.com/facebook/react-native/pull/24422
Reviewed By: cpojer
Differential Revision: D14895773
fbshipit-source-id: d428929cc4e5219e02f5920259e08e0b3d24874c