Removes the dismiss button from the pipeline header alert

This fixes a bug where hitting the dismiss button did nothing.
Instead of making it do something, we should simply try to realise…
There is no dismiss button.

Changelog: fixed

app/assets/javascripts/pipelines/components/header_component.vue

@@ -212,7 +212,9 @@ export default {
 </script>
 <template>
   <div class="js-pipeline-header-container">
-    <gl-alert v-if="hasError" :variant="failure.variant">{{ failure.text }}</gl-alert>
+    <gl-alert v-if="hasError" :variant="failure.variant" :dismissible="false">{{
+      failure.text
+    }}</gl-alert>
     <ci-header
       v-if="shouldRenderContent"
       :status="pipeline.detailedStatus"