Heptapod: new generic method to run SQL statements
It is called `psql` for emphasis that it is not based on a library client but on the CLI (ran in the proper context). For now, not implemented for source and remote instances, but we could do it by reading proper connection information from GitLab config for the former and from command-line args for the latter (of course a remote port can well not be available at all). Could also be less hardcoded in the future if needed.
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