Migrations: add Gitaly configuration
Add configuration of Gitaly and associated secrets to migrations chart. Some migrations require access to Gitaly, meaning that we now need these present within the pod. Adds - `.Values.gitaly` template - ConfigMap - move to `gitlab.yml.erb` - add `required` configuration of gitaly to `gitlab.scripts.configure` - trim `optional` from `gitlab.scripts.configure` - Update job with necessary mount template for Gitaly.
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