duplicate detection via change store #499

Job	Run time
Orchestrator Integration Test	1m 26s
Build and Unit Test	1m 40s
Tidy	1m 24s
Lint	59s
E2E Integration Test	3m 13s
Gateway Integration Test	1m 25s
Consumer Integration Test	1m 10s
Queue Extension Test	1m 9s
Counter Extension Test	1m 16s
Storage Extension Test	1m 25s
Required Checks	4s
	15m 11s

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