tests: Add retry metrics tests to ITOtelGoldenMetrics #674

Job	Run time
filter	1m 1s
build(21) except self-service clients	11m 50s
build(8) except for gapic-generator-java	3m 44s
build(8) for gapic-generator-java	11m 20s
gapic-generator-java-bom	2m 20s
build(8) for showcase	9m 52s
dependency_analyzer_unit_test	1m 21s
build(25) except self-service clients	12m 17s
build (11)	13m 31s
showcase-clirr	5m 35s
showcase (17)	10m 42s
build (17)	13m 53s
showcase (21)	10m 36s
showcase (11)	10m 39s
unmanaged_dependency_check	9m 42s
showcase (25)	10m 34s
	2h 18m 57s

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