Enforces structured logging in enterprise code (#13444)

Makefile

@@ -456,7 +456,7 @@ vet: ## Run mattermost go vet specific checks
 
 	$(GO) vet -vettool=$(GOPATH)/bin/mattermost-govet -license -structuredLogging ./...
 ifeq ($(BUILD_ENTERPRISE_READY),true)
-	$(GO) vet -vettool=$(GOPATH)/bin/mattermost-govet -enterpriseLicense ./enterprise/...
+	$(GO) vet -vettool=$(GOPATH)/bin/mattermost-govet -enterpriseLicense -structuredLogging ./enterprise/...
 endif
 
 todo: ## Display TODO and FIXME items in the source code.