Refactor StorageUnitMetaData to group by storage unit name #7303

Job	Run time
Import Global Environment / init-environment	6s
E2E - Agent with MySQL (proxy, tracing, jaeger)	9m 49s
E2E - Agent with MySQL (proxy, tracing, zipkin)	8m 16s
E2E - Agent with MySQL (proxy, metrics, prometheus)	8m 48s
E2E - Agent with MySQL (proxy, logging, file)	7m 49s
E2E - Agent with MySQL (jdbc, logging, file)	7m 53s
E2E - Agent with MySQL (jdbc, metrics, prometheus)	9m 34s
E2E - Agent with MySQL (jdbc, tracing, jaeger)	7m 39s
E2E - Agent with MySQL (jdbc, tracing, zipkin)	8m 19s
	1h 8m 13s

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