Gitaly deprecated and removed Namespace Service, we can remove
a repository instead

This explicitly imports gitaly v16 instead of v15 and removes the
old one from `go.mod`.

Prior to this change personal access tokens without a ttl would never
expire. In Gitlab 15.4 we deprecated non-expiring tokens and are
scheduled for removal in 16.0.

https://gitlab.com/gitlab-org/gitlab/-/issues/369122

This change alters the gitlab-shell command for creating tokens to
ensure add a default limit of 30 days.

Closes https://gitlab.com/gitlab-org/gitlab-shell/-/issues/640

It imitates a push to the secondary and verifies that the push
is redirected to the primary

This commit also excludes gitlab-shell from dependencies:

Gitaly specifies Gitlab Shell as a dependency as well in order
to use gitlabnet client to perform API endpoints to Gitlab Rails.
As a result, Gitlab Shell requires Gitaly -> Gitaly requires an
older version of Gitlab Shell -> that version requires an older
version of Gitlab Shell, etc. Let's use exclude to break the
chain earlier

After https://gitlab.com/gitlab-org/gitaly/-/merge_requests/4766
has been introduced, the test started fail because we basically
cancel the git-receive-pack after the output is received

This commit gracefully closes the connection to make the test
pass

While gitlab-shell currently has a major version of v14, the module path
it exposes is not using that major version like it is required by the Go
standard. This makes it impossible for dependents to import gitlab-shell
as a dependency without using a commit as version.

Fix this by changing the module path of gitlab-shell to instead be
`gitlab.com/gitlab-org/gitlab-shell/v14` and adjust all imports
accordingly.

Changelog: fixed

Before 9deaf47f1ecb00f0f36d18ee4a0fb1576f5a0efe, Gitaly would return
success for `SSHUploadPack` and `SSHUploadArchive` regardless of the
exit code of the `git upload-pack|archive` process. As a result, the
gitlab-sshd acceptance tests could rely on no errors being returned from
Gitaly.

Currently these tests send the minimum request needed to start a
session, causing the server git process to fail as the `0000` flush
packet to end the session is never sent.

This commit fixes the tests by sending the full request/response needed
for a successful git operation.

- We start supporting the "color" format for logs.
- We now respond to SIGHUP by reopening the log file.
- We now respect the log format when no log filename is specified.

Output to syslog in the event of logging system setup is preserved in
OpenSSH mode.

Changelog: added

Gitaly project now properly respects module release flow
and includes a module suffix in the package name. It requires
to re-write all non-suffixed imports with suffixed of a specific
version of tha module. With proper module versioning we don't
need to use a 'replace' directive to point to specific commit
and can use semantic versioning for the gitaly dependency.

Part of: https://gitlab.com/gitlab-org/gitaly/-/issues/3177

Contributes to https://gitlab.com/gitlab-org/gitlab-shell/-/issues/500

Contributes to https://gitlab.com/gitlab-org/gitlab-shell/-/issues/500

With this, we can start to build confidence in making changes to
gitlab-sshd.