Remove undefined from confidence and severity (!74) · Merge requests · GitLab.org / security-products / analyzers / common · GitLab

What does this MR do?

Removes undefined from severity and confidence and uses unknown as default.

What are the relevant issue numbers?

gitlab-org/gitlab#198157 (closed)

Does this MR meet the acceptance criteria?

Changelog entry added
Conforms to the code review guidelines
Conforms to the Go guidelines