Change design management empty state button style

https://gitlab.com/gitlab-org/gitlab/issues/13395

ee/app/assets/javascripts/design_management/components/upload/button.vue

@@ -36,7 +36,7 @@ export default {
         )
       "
       :disabled="isSaving"
-      variant="primary"
+      variant="success"
       @click="openFileUpload"
     >
       {{ s__('DesignManagement|Add designs') }}

ee/changelogs/unreleased/update-design-management-empty-state-button-style.yml

+---
+title: Change design management empty state button style
+merge_request: 18060
+author: George Tsiolis
+type: fixed

ee/spec/frontend/design_management/components/upload/__snapshots__/button_spec.js.snap

@@ -7,7 +7,7 @@ exports[`Design management upload button component renders inverted upload desig
   <glbutton-stub
     data-original-title="Adding a design with the same filename replaces the file in a new version."
     title=""
-    variant="primary"
+    variant="success"
   >
     
     Add designs
@@ -31,7 +31,7 @@ exports[`Design management upload button component renders loading icon 1`] = `
     data-original-title="Adding a design with the same filename replaces the file in a new version."
     disabled="true"
     title=""
-    variant="primary"
+    variant="success"
   >
     
     Add designs
@@ -60,7 +60,7 @@ exports[`Design management upload button component renders upload design button
   <glbutton-stub
     data-original-title="Adding a design with the same filename replaces the file in a new version."
     title=""
-    variant="primary"
+    variant="success"
   >
     
     Add designs