Fix bug causing empty scan.status when scan is successful

What does this MR do?

• Fixes a bug causing an empty scan.status when scan is successful, as explained in more detail here
• Retracts the following broken command releases:
  • v3.3.0
  • v3.3.1

What are the relevant issue numbers?

Scan.Status field is empty for successful analy... (gitlab-org/gitlab#557739 - closed) • Adam Cohen • 18.3

Testing

Tested in this pipeline.

Does this MR meet the acceptance criteria?

• Changelog entry added
• Documentation created/updated for GitLab EE, if necessary
• Documentation created/updated for this project, if necessary
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Job definition updated, if necessary
  • Auto-DevOps template
  • Job definition example
  • CI Templates
• Conforms to the code review guidelines
• Conforms to the Go guidelines
• Security reports checked/validated by reviewer