duplicate detection via change store #517

Job	Run time
E2E Integration Test	1m 40s
Tidy	1m 40s
Queue Extension Test	1m 21s
Lint	56s
Orchestrator Integration Test	1m 31s
Gateway Integration Test	1m 22s
Counter Extension Test	1m 11s
Consumer Integration Test	1m 11s
Build and Unit Test	1m 45s
Storage Extension Test	1m 15s
Required Checks	4s
	13m 56s

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