Merge branch 'discussions_on_system_notes' into 'master'

Fixed discussions created on system notes

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/96709



Merged-by: Heinrich Lee Yu <heinrich@gitlab.com>
Approved-by: Heinrich Lee Yu <heinrich@gitlab.com>
Reviewed-by: Heinrich Lee Yu <heinrich@gitlab.com>
Reviewed-by: Pavel Shutsin <pshutsin@gitlab.com>
Reviewed-by: Lucas Zampieri <lzampier@redhat.com>
Co-authored-by: Lucas Zampieri <lzampier@redhat.com>