Merge branch 'ph/432035/hideChecksIfNoMessageExists' into 'master'

Filter out merge checks where no message exists

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/142022



Merged-by: Kushal Pandya <kushal@gitlab.com>
Approved-by: Kushal Pandya <kushal@gitlab.com>
Co-authored-by: Phil Hughes <me@iamphill.com>