[DISCO-3226] Fix flaky amo backend unit test

[Herraj]

References

JIRA: DISCO-3226

Description

Found another flaky unit test that was failing on captured log output assertions. This test was failing because it was encountering an extra / leaked log output (WARN level) from other place.

I couldn't trace that extra leaky log output but I was able to set the level of logs we want to capture for this set.

PR Review Checklist

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• This PR conforms to the Contribution Guidelines
• The PR title starts with the JIRA issue reference, format example [DISCO-####], and has the same title (if applicable)
• [load test: (abort|skip|warn)] keywords are applied to the last commit message (if applicable)
• Documentation has been updated (if applicable)
• Functional and performance test coverage has been expanded and maintained (if applicable)

[ncloudioj]

Thanks!