Merge branch 'stomlinson/keyset-composite-pk' into 'master'

Support composite primary key in keyset pagination

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/148265



Merged-by: Matt Kasa <mkasa@gitlab.com>
Approved-by: Matt Kasa <mkasa@gitlab.com>
Co-authored-by: Simon Tomlinson <stomlinson@gitlab.com>