Merge branch '389306/system_note_metadata/fk' into 'master'

Prepare system_note_metadata for bigint migration

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/117485



Merged-by: Simon Tomlinson <stomlinson@gitlab.com>
Approved-by: Simon Tomlinson <stomlinson@gitlab.com>
Reviewed-by: Krasimir Angelov <kangelov@gitlab.com>
Reviewed-by: Simon Tomlinson <stomlinson@gitlab.com>
Co-authored-by: Krasimir Angelov <kangelov@gitlab.com>