tests: Add retry metrics tests to ITOtelGoldenMetrics #602

Job	Run time
filter	1m 2s
downstream-compatibility-spring-generator	11m 26s
downstream-compatibility (java-bigtable)	7m 24s
downstream-compatibility (java-bigquery)	3m 45s
downstream-compatibility (java-spanner-jdbc)	3m 28s
downstream-compatibility (java-pubsublite)	3m 38s
downstream-compatibility (java-firestore)	3m 28s
downstream-compatibility (java-storage)	5m 39s
downstream-compatibility (java-pubsub)	3m 1s
downstream-compatibility (java-storage-nio)	3m 53s
downstream-compatibility (java-spanner)	5m 4s
	51m 48s

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