Remove devexp from proto package names #339

Job	Run time
Storage Extension Test	2m 50s
Gateway Integration Test	4m 52s
Queue Extension Test	5m 5s
Counter Extension Test	2m 42s
Orchestrator Integration Test	4m 55s
Build and Unit Test	11m 3s
E2E Integration Test	5m 0s
Required Checks	4s
	36m 31s

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