Fix preview race condition

Since the API calls to get the pipeline and job object are made in
parallel, if the job call returned first it would trigger the effect to
get the job output and short-circuit.

arroyo-console/src/routes/pipelines/CreatePipeline.tsx

@@ -136,11 +136,11 @@ export function CreatePipeline() {
   };
 
   useEffect(() => {
-    if (pipeline && job) {
+    if (pipelineId && job) {
       if (outputSource) {
         outputSource.close();
       }
-      setOutputSource(useJobOutput(sseHandler, pipeline.id, job.id));
+      setOutputSource(useJobOutput(sseHandler, pipelineId, job.id));
     }
   }, [job?.id]);