Synchronize shutdown in stanza adapter (#34638) #47457

Job	Run time
windows-unittest-matrix (receiver-0)	15m 2s
windows-unittest-matrix (receiver-1)	16m 43s
windows-unittest-matrix (receiver-2)	15m 57s
windows-unittest-matrix (receiver-3)	14m 0s
windows-unittest-matrix (processor-0)	9m 39s
windows-unittest-matrix (processor-1)	9m 56s
windows-unittest-matrix (exporter-0)	8m 2s
windows-unittest-matrix (exporter-1)	17m 36s
windows-unittest-matrix (exporter-2)	8m 31s
windows-unittest-matrix (exporter-3)	9m 40s
windows-unittest-matrix (extension)	10m 53s
windows-unittest-matrix (connector)	8m 14s
windows-unittest-matrix (internal)	10m 28s
windows-unittest-matrix (pkg)	10m 31s
windows-unittest-matrix (cmd-0)	4m 6s
windows-unittest-matrix (cmd-1)	10m 45s
windows-unittest-matrix (other)	10m 36s
windows-unittest	0s
	3h 10m 39s

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