It adds correlation ids wherever possible

refactor: remove commandargs.GenericArgs

Closes #212

See merge request gitlab-org/gitlab-shell!506

parse logic will only run if the executable accept args.
healthcheck is the only one not accepting arguments.

Modify regex to prevent partial matches

See merge request gitlab-org/security/gitlab-shell!6

Logrus buffers its output internally, which makes these tests fail
intermittently. They're also not a good example to follow generally.

We now have acceptance tests that exercise this functionality so I'm
pretty relaxed about losing the expectations. However, we can test
them by inspecting the server-received metadata too, so there's no loss
of coverage here.

The move from logrus to labkit for logging also makes these tests hard
to justify keeping.