feat: update storage utilization metrics to start when app is initialized #8095
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Description
per https://confluentinc.atlassian.net/browse/KCI-938, make storage utilization per node metrics initialized when the app starts up. this means that even if the app has no queries, we'll still be getting metrics at the node level. previously, we'd only see node level metrics after we created a query
Testing done
kept existing unit tests
Reviewer checklist