[chore] [exporter/signalfx] Rework property/tags update tests (#36086) #93279

Job	Run time
windows-unittest-matrix (receiver-0)	18m 24s
windows-unittest-matrix (receiver-1)	12m 34s
windows-unittest-matrix (receiver-2)	12m 56s
windows-unittest-matrix (receiver-3)	14m 4s
windows-unittest-matrix (processor-0)	6m 59s
windows-unittest-matrix (processor-1)	12m 41s
windows-unittest-matrix (exporter-0)	7m 55s
windows-unittest-matrix (exporter-1)	11m 44s
windows-unittest-matrix (exporter-2)	10m 54s
windows-unittest-matrix (exporter-3)	10m 10s
windows-unittest-matrix (extension)	13m 15s
windows-unittest-matrix (connector)	9m 58s
windows-unittest-matrix (internal)	9m 55s
windows-unittest-matrix (pkg)	8m 19s
windows-unittest-matrix (cmd-0)	5m 13s
windows-unittest-matrix (cmd-1)	6m 3s
windows-unittest-matrix (other)	10m 58s
windows-unittest	0s
	3h 2m 2s

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