Apply gl-button class to invites directory

app/views/invites/show.html.haml

@@ -25,5 +25,5 @@
 
 - if !member?
   .actions
-    = link_to _("Accept invitation"), accept_invite_url(@token, new_user_invite: params[:new_user_invite]), method: :post, class: "btn btn-success"
-    = link_to _("Decline"), decline_invite_url(@token), method: :post, class: "btn btn-danger gl-ml-3"
+    = link_to _("Accept invitation"), accept_invite_url(@token, new_user_invite: params[:new_user_invite]), method: :post, class: "btn gl-button btn-success"
+    = link_to _("Decline"), decline_invite_url(@token), method: :post, class: "btn gl-button btn-danger gl-ml-3"

changelogs/unreleased/-231183-invites.yml

+---
+title: Apply GitLab UI button styles to buttons in app/views/invites directory
+merge_request: 44289
+author: Lakshit
+type: other