BCI-3345 Fix MultiNode's flaky metrics test

[dhaidashenko]

The flakiness of the original test might have been caused by CL Node's failure to gracefully shut down in some cases. However, it's unclear why the graceful shutdown issue only occurred for this test or what caused it. I failed to reproduce the failure of the test locally. To improve reliability while maintaining coverage, I've switched to a lighter version of the test that does not require starting a full CL Node with a database connection.

[cl-sonarqube-production[bot]]

Quality Gate passed

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0 Fixed issues
0 Accepted issues

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0.0% Duplication on New Code

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[github-actions[bot]]

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