This changes the repository type from a binary `wiki?` to a type. So
we can have more than 2 repository types.

Now everywhere we called `.wiki?` and expected a boolean, we check
that type.

Resolve CE to EE differences in the lib/api directory

See merge request gitlab-org/gitlab-ce!25430

The repository_path is no longer needed since
https://gitlab.com/gitlab-org/gitlab-shell/merge_requests/231, which closes
https://gitlab.com/gitlab-org/gitlab-shell/issues/135.

This adds a method to API::Internal that returns the URL to use for LFS
authentication tokens. This makes it possible for EE to redefine this
behaviour, without having to directly modify the source code.

This will enable us to track the human-readable project path with SSH
access in gitlab-shell. Currently the Gitaly logs will only show the
hashed storage and gl_repository path (e.g. project-1234).

When using git-lfs with SSH we weren't passing in
the expires_header header which is allows large
transfers to succeed in the event the current
default of 30 mins expires.

https://github.com/git-lfs/git-lfs/blob/master/docs/api/server-discovery.md#ssh

gitlab-org/gitlab-shell!166 added support for collecting push options
from the environment, and passing them along to the
/internal/post_receive API endpoint.

This change handles the new push_options JSON element in the payload,
and passes them on through to the GitPushService and GitTagPushService
services.

Futhermore, it adds support for the first push option, ci.skip.  With
this change, one can use 'git push -o ci.skip' to skip CI pipe
execution. Note that the pipeline is still created, but in the "skipped"
state, just like with the 'ci skip' commit message text.

Implements #18667

Whenever a git push takes more than 50 seconds the user
will receive a trace from each check performed along with
their timings