chore: Suppress noisy logrus warnings in tests

What does this MR do?

The test summary widget expects clean output to render results. By suppressing the WARN logs we get that and they reduce the noisiness during local testing

What are the relevant issue numbers?

See context gosec!158 (comment 1066873561)

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
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  • Job definition example
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• Ensure the report version matches the equivalent schema version
• Conforms to the code review guidelines
• Conforms to the Go guidelines
• Security reports checked/validated by reviewer