UX Polish: Update top right Upload button from Green to Grey

app/assets/javascripts/design_management_new/components/upload/button.vue

@@ -38,7 +38,7 @@ export default {
         )
       "
       :disabled="isSaving"
-      variant="success"
+      variant="default"
       size="small"
       @click="openFileUpload"
     >

changelogs/unreleased/229955-ux-polish-update-top-right-upload-button-from-green-to-grey.yml

+---
+title: 'UX Polish: Update top right Upload button from Green to Grey'
+merge_request: 37558
+author:
+type: fixed

spec/frontend/design_management_new/components/upload/__snapshots__/button_spec.js.snap

@@ -9,7 +9,7 @@ exports[`Design management upload button component renders inverted upload desig
     icon=""
     size="small"
     title="Adding a design with the same filename replaces the file in a new version."
-    variant="success"
+    variant="default"
   >
     
     Upload designs
@@ -35,7 +35,7 @@ exports[`Design management upload button component renders loading icon 1`] = `
     icon=""
     size="small"
     title="Adding a design with the same filename replaces the file in a new version."
-    variant="success"
+    variant="default"
   >
     
     Upload designs
@@ -66,7 +66,7 @@ exports[`Design management upload button component renders upload design button
     icon=""
     size="small"
     title="Adding a design with the same filename replaces the file in a new version."
-    variant="success"
+    variant="default"
   >
     
     Upload designs