Resolve "Implement integration tests for applications"

.devcontainer/Dockerfile

.gitlab/ci/.test.yml

application-framework/registration/registration.go

applications/arista-routing-engine/main.go

applications/basic-interface-monitoring/main.go

applications/hostname-checker/main.go

applications/ws-events/main.go

...v_data/docker-compose/integration-test_docker-compose.yml

integration-tests/application_tests/appUtility_test.go

integration-tests/application_tests/application_test.go

integration-tests/application_tests/eventAssertion_test.go

integration-tests/example_tests/example_test.go