feat: Increase saturation point for pgbouncer max client connections

Matt Smileyrequested to merge
increase_pgbouncer_max_client_conn_pool into master

This change to the monitoring saturation point corresponds with the actual config change made in this chef MR: https://gitlab.com/gitlab-com/gl-infra/chef-repo/-/merge_requests/2196

Which aims to help resolve this incident: gitlab-com/gl-infra/production#7565 (closed)

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