Production checks slack notification
Refactor ReleaseTools::Promotion::ProductionStatus
extracting each check
in it's own class.
Allow checks results to be rendered as issue body as well as a slack message.
Now ReleaseTools::Promotion::Manager
can authorize a production
deployment or simply perform the checks and notify release managers of
the result.
Closes gitlab-com/gl-infra/delivery#1092 (closed)
Related to gitlab-com/gl-infra/delivery#1168 (closed)
Edited by Alessio Caiazza