getdeps: fix node/yarn detection for watchman builds
Summary: When we detect that we are building out of the fbsource monorepo internal to FB, pre-set some environment variables to help projects detect our internally pinned versions of node and yarn. Previously, the detection logic was deciding that the `yarn` shell script was the executable to invoke, but since that is a bash script it would fail to spawn. Reviewed By: simpkins Differential Revision: D18523871 fbshipit-source-id: b932d2b0ccd7b79d6f9cd74d363bc426c288e38f
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