fix: filter by pipeline or group when clicking on a line

app/frontend/javascript/pipeline-graph/index.js

@@ -226,6 +226,8 @@ const applyMouseEvents = function () {
   // when an edge is clicked, filter the graph to show only that pipeline
   core.on('click', 'edge', (event) => {
     const pipeline = event.target.data('pipeline')
-    applyFilter(pipeline)
+    const group = event.target.data('group')
+    const pipelineOrGroup = pipeline || group
+    applyFilter(pipelineOrGroup)
   })
 }