duplicate detection via change store #480

Job	Run time
Build and Unit Test	1m 57s
Queue Extension Test	2m 44s
E2E Integration Test	3m 20s
Tidy	1m 41s
Gateway Integration Test	3m 8s
Counter Extension Test	1m 53s
Orchestrator Integration Test	3m 17s
Lint	1m 10s
Consumer Integration Test	1m 45s
Storage Extension Test	2m 1s
Required Checks	3s
	22m 59s

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