https://gitlab.com/gitlab-org/gitlab/-/merge_requests/76491

* replaces the DastSiteProfile ci variable from `DAST_API_SPECIFICATION` 
  to `DAST_API_OPENAPI` as suggested here
  https://gitlab.com/gitlab-org/gitlab/-/merge_requests/73564#note_738732568
* remove the `GIT_STRATEGY: none` as suggested here
  https://gitlab.com/gitlab-org/gitlab/-/issues/347255#note_754003722