Concentrate security tasks into one issue
What does this MR do?
Updates security classes and rake tasks to return one single issue instead of three.
Particularly:
- Modifies
SecurityPatchIssue
to handle an array of versions instead of a single one. - Modifies
security:prepare
tasks to send an array of versions to the SecurityPatchIssue
Related to https://gitlab.com/gitlab-org/release-tools/issues/380
Edited by Mayra Cabrera