Allow configuring redis start_down and set_replicaof independently

What does this MR do?

Adds a redis['set_replicaof'] attributes that configures whether the replicaof <masterip> <masterport> line in redis.conf is rendered.

The attribute defaults to false, and is set to true when redis['ha'] is set to true, unless redis['master'] is set to true (default). With redis['ha'] set to false, the set_replicaof attribute can be toggled to true or false independently.

As suggested in https://gitlab.com/gitlab-com/gl-infra/chef-repo/-/merge_requests/2707#note_1232269487, I also added a new redis['start_down'] attribute. We should be able to deprecate the redis['ha'] attribute, which as noted in that discussion is a holdover attribute that mostly controls start_down behavior.

Related issues

• #7381 (closed)

Checklist

See Definition of done.

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Closes #7381 (closed)