[receiver/awsfirehosereceiver] Fix timestamp in cwlogs (#36122) #16601

Job	Run time
arm-unittest-matrix (receiver-0)	5m 29s
arm-unittest-matrix (receiver-1)	7m 4s
arm-unittest-matrix (receiver-2)	8m 34s
arm-unittest-matrix (receiver-3)	6m 11s
arm-unittest-matrix (processor-0)	3m 35s
arm-unittest-matrix (processor-1)	4m 57s
arm-unittest-matrix (exporter-0)	3m 6s
arm-unittest-matrix (exporter-1)	9m 38s
arm-unittest-matrix (exporter-2)	4m 5s
arm-unittest-matrix (exporter-3)	4m 54s
arm-unittest-matrix (extension)	4m 56s
arm-unittest-matrix (connector)	4m 16s
arm-unittest-matrix (internal)	6m 9s
arm-unittest-matrix (pkg)	3m 39s
arm-unittest-matrix (cmd-0)	1m 12s
arm-unittest-matrix (cmd-1)	1m 58s
arm-unittest-matrix (other)	4m 17s
arm-unittest	1s
	1h 24m 1s

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