duplicate detection via change store #516

Job	Run time
Orchestrator Integration Test	1m 29s
Lint	1m 3s
Counter Extension Test	1m 9s
Storage Extension Test	1m 12s
Build and Unit Test	1m 52s
Consumer Integration Test	1m 15s
Queue Extension Test	1m 17s
Tidy	1m 21s
Gateway Integration Test	1m 23s
E2E Integration Test	1m 28s
Required Checks	3s
	13m 32s

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