Migrate GitLab-Shell Hooks and gitlab-project to Gitaly

As per https://gitlab.com/charts/helm.gitlab.io/issues/14, Gitaly currently has a direct dependency on several GitLab-Shell components.

Once the features that rely on the Gitlab-Shell components are fully migrated to Gitaly (as in, feature status is set to mandatory), we can migrate GitLab-Shell Hooks and gitlab-project into Gitaly and remove them from GitLab-Shell.

This will mean that GitLab-Shell will not need to ship with Gitaly and will allow for simplification of the helm charts.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information