duplicate detection via change store #496

Job	Run time
Queue Extension Test	1m 10s
Consumer Integration Test	1m 16s
Lint	56s
E2E Integration Test	2m 15s
Build and Unit Test	1m 52s
Tidy	1m 18s
Gateway Integration Test	1m 36s
Storage Extension Test	1m 41s
Counter Extension Test	1m 11s
Orchestrator Integration Test	1m 29s
Required Checks	-1s
	14m 43s

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