processor/tailsampling: stabilize TestDropLargeTraces metric assertions #57387

Job	Run time
setup-environment	2m 10s
arm-unittest-matrix (receiver-0)	6m 52s
arm-unittest-matrix (receiver-1)	7m 26s
arm-unittest-matrix (processor-1)	4m 20s
arm-unittest-matrix (receiver-3)	6m 42s
arm-unittest-matrix (processor-0)	3m 49s
arm-unittest-matrix (exporter-1)	9m 42s
arm-unittest-matrix (receiver-2)	6m 31s
arm-unittest-matrix (exporter-3)	6m 2s
arm-unittest-matrix (pkg)	5m 14s
arm-unittest-matrix (exporter-0)	3m 32s
arm-unittest-matrix (extension)	6m 36s
arm-unittest-matrix (internal)	9m 54s
arm-unittest-matrix (exporter-2)	3m 59s
arm-unittest-matrix (other)	6m 44s
arm-unittest-matrix (cmd-0)	3m 1s
arm-unittest-matrix (connector)	4m 30s
arm-unittest	3s
flakytests-generate-issues	-1s
	1h 37m 6s

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