Ensure pipeline job items in a stage have appropriate border radius

Bridge type jobs are given a large border radius, but when these job
items are shown as part of a stage column they should have our base
border radius to match up with the parent container's border radius.

Changelog: fixed

app/assets/javascripts/ci/pipeline_details/graph/components/stage_column_component.vue

@@ -79,7 +79,7 @@ export default {
   jobClasses: [
     'gl-p-3',
     'gl-border-0',
-    'gl-rounded-base',
+    '!gl-rounded-base',
     'hover:gl-bg-strong',
     'focus:gl-bg-strong',
     'hover:gl-text-gray-900',

spec/frontend/ci/pipeline_details/graph/components/graph_component_spec.js

@@ -219,7 +219,7 @@ describe('graph component', () => {
       const jobClasses = [
         'gl-p-3',
         'gl-border-0',
-        'gl-rounded-base',
+        '!gl-rounded-base',
         'hover:gl-bg-strong',
         'focus:gl-bg-strong',
         'hover:gl-text-gray-900',