Always log SpotBugs process output on non-zero exit code

What does this MR do?

To ease debugging of SAST pipeline failures, if the SpotBugs process fails, log its output regardless of SECURE_LOG_LEVEL.

What are the relevant issue numbers?

This addresses gitlab-org/gitlab#216942 (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 updated/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