Rename GlNewButton to GlButton

The GlNewButton component has been renamed
to GlButton in Gitlab UI 12.0

app/assets/javascripts/static_site_editor/components/invalid_content_message.vue

 <script>
-import { GlNewButton } from '@gitlab/ui';
+import { GlButton } from '@gitlab/ui';
 
 export default {
   components: {
-    GlNewButton,
+    GlButton,
   },
 };
 </script>
@@ -19,10 +19,10 @@ export default {
       }}
     </p>
     <div>
-      <gl-new-button
+      <gl-button
         ref="documentationButton"
         href="https://gitlab.com/gitlab-org/project-templates/static-site-editor-middleman"
-        >{{ s__('StaticSiteEditor|View documentation') }}</gl-new-button
+        >{{ s__('StaticSiteEditor|View documentation') }}</gl-button
       >
     </div>
   </div>

ee/app/assets/javascripts/packages/list/components/packages_list_row.vue

 <script>
 import PackageTags from '../../shared/components/package_tags.vue';
 import PublishMethod from './publish_method.vue';
-import { GlNewButton, GlIcon, GlLink, GlSprintf, GlTooltipDirective } from '@gitlab/ui';
+import { GlButton, GlIcon, GlLink, GlSprintf, GlTooltipDirective } from '@gitlab/ui';
 import { getPackageType } from '../../shared/utils';
 import timeagoMixin from '~/vue_shared/mixins/timeago';
 import { mapState } from 'vuex';
@@ -9,7 +9,7 @@ import { mapState } from 'vuex';
 export default {
   name: 'PackagesListRow',
   components: {
-    GlNewButton,
+    GlButton,
     GlIcon,
     GlLink,
     GlSprintf,
@@ -108,7 +108,7 @@ export default {
     </div>
 
     <div v-if="deleteAvailable" class="table-section section-10 d-flex justify-content-end">
-      <gl-new-button
+      <gl-button
         ref="action-delete"
         icon="remove"
         category="primary"

ee/spec/frontend/packages/list/components/__snapshots__/packages_list_row_spec.js.snap

@@ -84,7 +84,7 @@ exports[`packages_list_row renders 1`] = `
   <div
     class="table-section section-10 d-flex justify-content-end"
   >
-    <gl-new-button-stub
+    <gl-button-stub
       aria-label="Remove package"
       category="primary"
       icon="remove"