Restore className assignment and update test comments. [ci-skip]

app/assets/javascripts/pipelines/components/graph/graph_component.vue

@@ -53,7 +53,7 @@
 
         // If it's the first stage column and only has one job
         if (index === 0 && stage.groups.length === 1) {
-          className = 'left-margin';
+          className = 'no-margin';
         } else if (index > 0) {
           // If it is not the first column
           className = 'left-margin';

app/assets/javascripts/pipelines/stores/pipeline_store.js

@@ -19,10 +19,10 @@ export default class PipelineStore {
 
   storePipeline(pipeline = {}) {
     // single job in first stage
-   // graph[0].groups = [graph[0].groups[0]];
+    pipeline.details.stages[3].groups = [pipeline.details.stages[0].groups[0]];
 
     // multiple jobs in last stage
-    // graph[3].groups.push(graph[0].groups[0]);
+    // pipeline.details.stages[3].groups.push(pipeline.details.stages[0].groups[0]);
     this.state.pipeline = pipeline;
     this.state.triggered_by = mockTriggerers;
 

app/assets/stylesheets/pages/pipelines.scss

@@ -1076,6 +1076,7 @@
       @include flat-connector-before;
     }
   }
+
   .build {
     &:first-child {
       &::after {