feat: Implement comprehensive test suite for Activity API (004-activity-api-tests) #58

Job	Run time
Setup Environment	4s
Run API Contract Tests / Run API Contract Tests	30s
Run Unit Tests with Coverage / Run Unit Tests	44s
Build and Push Container Image / Build Container Image	1m 50s
Retrieve Container Image	30s
Run Bicep Linter / Lint Bicep Template	40s
Validate Template / Validate Bicep Template	1m 12s
Preview Changes / Preview Bicep Template Deployment	1m 1s
Deploy Template to Dev / Deploy Bicep Template	1m 21s
Run E2E Tests Against Dev / Run E2E Tests with Cosmos DB Emulator	1m 12s
	9m 4s

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