tests: Add retry metrics tests to ITOtelGoldenMetrics #599

Job	Run time
filter	1m 3s
downstream-compatibility-spring-generator	10m 46s
downstream-compatibility (java-bigtable)	7m 35s
downstream-compatibility (java-storage)	6m 34s
downstream-compatibility (java-pubsublite)	4m 29s
downstream-compatibility (java-firestore)	3m 41s
downstream-compatibility (java-storage-nio)	3m 25s
downstream-compatibility (java-spanner-jdbc)	2m 53s
downstream-compatibility (java-bigquery)	4m 58s
downstream-compatibility (java-spanner)	5m 40s
downstream-compatibility (java-pubsub)	3m 10s
	54m 14s

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