feat(api): Add preview endpoint (#6648) #1207

Job	Run time
test_worker (novu/worker) / e2e_worker_service	4m 13s
test_worker (novu/worker-ee) / e2e_worker_service	4m 18s
build_dev_worker (novu/worker-ee)	12m 27s
build_dev_worker (novu/worker)	12m 12s
deploy_dev_workers / infrastructure_data	20s
deploy_dev_workers / deploy_worker_queue (dev-worker-container, dev-worker-service-inbound-parse-mail, dev-worker-task...	4m 55s
deploy_dev_workers / deploy_worker_queue (dev-worker-container, dev-worker-service-metric-active-jobs, dev-worker-task...	6m 2s
deploy_dev_workers / deploy_worker_queue (dev-worker-container, dev-worker-service-process-subscriber, dev-worker-task...	5m 8s
deploy_dev_workers / deploy_worker_queue (dev-worker-container, dev-worker-service-standard, dev-worker-task-standard)	5m 3s
deploy_dev_workers / deploy_worker_queue (dev-worker-container, dev-worker-service-trigger-handler, dev-worker-task-tr...	5m 2s
New Relic Deploy	7s
	59m 47s

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