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f2cb76f9 - Try bootstrapping tpu env from env vars (#4499)

Try bootstrapping tpu env from env vars (#4499) * Try bootstrapping tpu env from env vars * Try bootstrapping tpu env from env vars * Formatting * Mock env vars * Use TPU_SKIP_MDS_QUERY --------- Co-authored-by: root <root@t1v-n-804806aa-w-0.us-central2-b.c.tpu-pytorch.internal>