Merge branch 'fix_rightsidebar_overlapping_build_section' into 'master'

Fix right sidebar overlapping build section in merge request

closes #14608 

![build](/uploads/d1902f5fa335274c92ac1b1a8193466f/build.gif)


See merge request !3415

app/assets/stylesheets/pages/merge_requests.scss

@@ -230,3 +230,9 @@
     }
   }
 }
+
+.builds {
+  .table-holder {
+    overflow-x: scroll;
+  }
+}