Merge branch 'ce-5194-fix-github-ci-cd-github-auth-missing-query-param' into 'master'

Add `?ci_cd_only=true` query parameter to CI/CD GitHub status link -- CE backport

See merge request gitlab-org/gitlab-ce!17661

app/views/import/github/new.html.haml

@@ -10,7 +10,7 @@
   %p
     = import_github_authorize_message
 
-  = link_to _('List your GitHub repositories'), status_import_github_path, class: 'btn btn-success'
+  = link_to _('List your GitHub repositories'), status_import_github_path(ci_cd_only: params[:ci_cd_only]), class: 'btn btn-success'
 
   %hr