.circleci: Remove docker_hub_index_job, wasn't used (#41800)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/41800
Signed-off-by: Eli Uriegas <eliuriegas@fb.com>
Test Plan: Imported from OSS
Reviewed By: soumith
Differential Revision: D22645363
Pulled By: seemethere
fbshipit-source-id: 35ed43ed5fb4053f71dc9525c4ed62f1c60eacc1
