Implement close security implementation issues
What does this MR do?
Implements a new service to automatically close the security implementation issues.
With gitlab-com/gl-infra&109 (closed), security implementation issues are processed in a different manner:
- Approximately 1 week before the due date, security MR's targeting master are merged into Security master,
- Then during the Security Release, the backports are merged.
With this new process, security implementation issues are still opened even if all their merge requests were merged. This MR introduces a new service to automatically close the security issues. This should be the last step on the security release.
Related to gitlab-com/gl-infra/delivery#1106 (closed)