Update danger/metadata/Dangerfile, .gitlab-ci.yml files
Added Dangerbot to ensure we get our labels correct and follow general gitlab hygiene.
I tried to refer to existing Dangerbot files that were elsewhere in GitLab so that the content did not have to get duplicated.
danger.import_dangerfile(gitlab: 'gitlab-org/gitlab', path: 'danger/metadata'), however this did not seem to run properly against the DAST repo.
Edited by Seth Berger