tests: Add retry metrics tests to ITOtelGoldenMetrics (#12672) #691

Job	Run time
filter	1m 0s
build(21) except self-service clients	12m 7s
build(25) except self-service clients	12m 35s
build(8) for gapic-generator-java	11m 4s
build (17)	13m 9s
build(8) except for gapic-generator-java	3m 42s
build(8) for showcase	4m 55s
build (11)	13m 47s
gapic-generator-java-bom	2m 18s
dependency_analyzer_unit_test	48s
showcase (11)	10m 57s
showcase (25)	10m 43s
showcase-clirr	-1s
showcase (17)	10m 50s
showcase (21)	11m 4s
unmanaged_dependency_check	8m 20s
	2h 7m 18s

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