Summary: This diff makes babel transformation cache key stable. With the previous approach it was changed on each CI build so it was not possible to persist cache between builds. Now it is computed from the transformation package content after each build. Because of that it is equal for every CI build while Babel transformations unchanged and so we could use same cache on different Sandcastle agents. In addition to that, it makes it possible to specify directory for Metro cache so we can save/restore it in CI builds. Reviewed By: mweststrate Differential Revision: D26877989 fbshipit-source-id: 7cb04a177f86e61986585e5a74d9c7396ddddc18
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