Refactor StorageUnitMetaData to group by storage unit name #7299

Job	Run time
Import Global Environment / init-environment	7s
E2E - Agent with MySQL (proxy, tracing, jaeger)	8m 9s
E2E - Agent with MySQL (proxy, tracing, zipkin)	9m 46s
E2E - Agent with MySQL (proxy, metrics, prometheus)	8m 11s
E2E - Agent with MySQL (proxy, logging, file)	7m 46s
E2E - Agent with MySQL (jdbc, logging, file)	7m 57s
E2E - Agent with MySQL (jdbc, metrics, prometheus)	9m 54s
E2E - Agent with MySQL (jdbc, tracing, jaeger)	7m 37s
E2E - Agent with MySQL (jdbc, tracing, zipkin)	9m 32s
	1h 8m 59s

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