Add downstream test for Java11

What does this MR do?

We aren't properly testing Java11 support. This MR adds a downstream test covering Java 11

What are the relevant issue numbers?

gitlab-org/gitlab#207317 (closed) and relates to gitlab-org/gitlab#258815 (closed)

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 (also in CE)
  • Job definition example
  • CI Templates (to be removed)
  • Vendored CI Templates (also in CE)
• Conforms to the code review guidelines
• Conforms to the Go guidelines
• Security reports checked/validated by reviewer