Promethues, Gitaly and Praefect listen on 0.0.0.0

What does this MR do?

Listening on the internal IP address of each node complicates the configuration of Gitaly HA in what is likely already a firewalled network running on a cloud provider. The default configuration should be simple to configure.

Until problems with Tableflip are resolved, an extra restart is required.

Related issues

Related to gitaly#2734 (closed)

Author's checklist (required)

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