[CI] docker-clang-format nightly failing

[asfimport]

Don't know what happened but this needs to either be fixed or removed from the nightlies

Successfully built 86ece22bd823
Successfully tagged arrowdev/arrow-lint:latest
WARNING: The CI_ARROW_SHA variable is not set. Defaulting to a blank string.
WARNING: The CI_ARROW_BRANCH variable is not set. Defaulting to a blank string.
ERROR: No such service: clang-format
Exited with code 1

https://circleci.com/gh/ursa-labs/crossbow/3923?utm_campaign=vcs-integration-link&utm_medium=referral&utm_source=github-build-link

Reporter: Wes McKinney / @wesm
Assignee: Neal Richardson / @nealrichardson

_{Note: This issue was originally created as ARROW-6914. Please see the migration documentation for further details.}

[asfimport]

Kouhei Sutou / @kou:
We can remove this because clang-format is merged into lint.

ARROW-7034 removed this.