Héctor Ramos 4f078d3fe2 Consolidate checkout and yarn steps
Summary:
Add checkout steps to reduce number of checkout/yarn calls

Tested on Circle CI.
Closes https://github.com/facebook/react-native/pull/17915

Differential Revision: D6942564

Pulled By: hramos

fbshipit-source-id: 72aff33eb099e24d63a80ec7d0630afedc21b630
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