Fixes pipeline status cell is too wide by adding missing classes in table head cells

Adds mr id to changelog

app/assets/javascripts/vue_pipelines_index/pipelines.js.es6

@@ -73,12 +73,12 @@
           <table class="table ci-table">
             <thead>
               <tr>
-                <th>Status</th>
-                <th>Pipeline</th>
-                <th>Commit</th>
-                <th>Stages</th>
-                <th></th>
-                <th class="hidden-xs"></th>
+                <th class="pipeline-status">Status</th>
+                <th class="pipeline-info">Pipeline</th>
+                <th class="pipeline-commit">Commit</th>
+                <th class="pipeline-stages">Stages</th>
+                <th class="pipeline-date"></th>
+                <th class="pipeline-actions hidden-xs"></th>
               </tr>
             </thead>
             <tbody>

changelogs/unreleased/26615-pipeline-status-cell.yml

+---
+title: Fixes pipeline status cell is too wide by adding missing classes in table head cells
+merge_request: 8549
+author: