Merge branch 'id-connection-pool-patch-for-next-rails' into 'master'

Include connection pool patch only for the current Rails version

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/167193



Merged-by: Igor Drozdov <idrozdov@gitlab.com>
Approved-by: Stan Hu <stanhu@gmail.com>
Approved-by: Dylan Griffith <dyl.griffith@gmail.com>
Reviewed-by: Igor Drozdov <idrozdov@gitlab.com>