Merge branch 'slashmanov/rapid-diffs-expand-lines-3-layer-arch' into 'master'

Implement Expand lines for Rapid Diffs

Closes #454983

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/154910



Merged-by: Stanislav Lashmanov <slashmanov@gitlab.com>
Approved-by: Phil Hughes <me@iamphill.com>
Reviewed-by: Phil Hughes <me@iamphill.com>
Reviewed-by: Stanislav Lashmanov <slashmanov@gitlab.com>