Update compat flag for consul in GitLab 16.0
The following discussion from !6422 (merged) should be addressed:
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@rmarshall started a discussion: I understand this is to keep our changes minimal, but given this is going away, I'm noting so we can resolve to a follow up issue for the deprecation when we do the next consul upgrade.
disable_compat_1.9 This allows users to disable metrics deprecated in 1.9 so they are no longer emitted, improving performance and reducing storage in large deployments. As of 1.12 this defaults to true and will be removed, along with 1.9 style http metrics in 1.13.
When we upgrade GitLab to 16.0, we need reset this default to true, so we match the consul 1.12 defaults and are unblocked from updating consul to 13.0