Decouple gcsfuse initialization from make_examples
Decouple gcsfuse initialization from make_examples

It seems sometime workers fail due to gcsfuse mount is not ready. To fix this
we first initialize all gcsfuse directories, wait for 10 seconds, list the
directories to make sure they exist, and then start make_examples.

PiperOrigin-RevId: 236330583

google/deepvariant,google/deepvariant,google/deepvariant