Add ability to customise Gitaly storage paths
Closes https://gitlab.com/gitlab-org/quality/gitlab-environment-toolkit/-/issues/101
MR adds the ability for users to customise the Gitaly storage paths, both for either Sharded or Cluster named gitlab_sharded_storage_path
and gitlab_cluster_storage_path
respectively. In the formers case the setting just sets the parent directory.
Edited by Grant Young