Add statement_timeout check to the check GitLab configuration rake task

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What

Add another check to the check GitLab configuration rake task. Confirm the statement_timeout to be set to a value greater than 0 (default 60 secs) per our PostgreSQL tuning in the documented requirements

Why

A statement timeout prevents runaway issues with locks and the database rejecting new clients. It also helps prevent a database related issue from eventually causing downtime. One minute matches the Puma rack timeout setting.

These rake tasks are also part of the pre-upgrade and post-upgrade checks, which should help catch the fact that it is not set prior to an upgrade.