Prevent debounceFetchNodes from jumping node view (#2560)

Any of the events which trigger debounceFetchNodes should call
fetchNodes[Only] with the current props node specified. This prevents a
pipeline view from jumping to the first still-running parallel stage
when any non-first stage is focused and a handled non-pipeline_step
event is received.

Removed unnecessary fetchNodesOnly parameter. Addition for CI.

blueocean-dashboard/src/main/js/components/karaoke/components/Pipeline.jsx

@@ -50,9 +50,10 @@ export default class Pipeline extends Component {
         this.debounceFetchNodes = debounce((karaokeOut) => {
             logger.debug('sse fetch it', this.karaoke);
             if (karaokeOut) {
-                this.pager.fetchNodesOnly({});
+                this.pager.fetchNodesOnly();
             } else {
-                this.pager.fetchNodes({});
+                const { node } = this.props.params;
+                this.pager.fetchNodes({ node });
             }
         }, 200);
     }