Geo clusters need at least a db_pool value of 3
requested to merge 201948-qa-failure-in-master-ee-geo-job-mostly-qa-support-repeater-waitexceedederror into master
This MR aims to address the failures outlined in https://gitlab.com/gitlab-org/gitlab/issues/201948.
At this stage I haven't investigated why we need to bump db_pool from 1 -> 5 but I experimented and found db_pool needs to be at least 3 for the tests to pass.