Merge branch 'dg-503834-show-related-mrs' into 'master'

Show Related MRs on development widget

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/174812



Merged-by: Natalia Tepluhina <ntepluhina@gitlab.com>
Approved-by: Nick Leonard <nleonard@gitlab.com>
Approved-by: Fernanda Toledo <ftoledo@gitlab.com>
Approved-by: Natalia Tepluhina <ntepluhina@gitlab.com>
Reviewed-by: Natalia Tepluhina <ntepluhina@gitlab.com>
Reviewed-by: Fernanda Toledo <ftoledo@gitlab.com>
Co-authored-by: Deepika Guliani <dguliani@gitlab.com>