Stop replicating git config
We're removing the last field from the repository's git config that is user writable in Remove SetFullPath and FullPath (#4526 - closed). We're still replicating the git config between nodes: https://gitlab.com/gitlab-org/gitaly/-/blob/4c394e14f04725bd7973daa7f2efad1b39755225/internal/gitaly/service/repository/replicate.go#L88-90. Once we've removed the last writable field from the config, we should stop replicating it across nodes. The config should be considered local to the replica and in practice they won't have any fields that affect behavior. As we don't provide any way to write into a config, the WAL will not support config writes.