Remove btn classes for consistent caret sizes

MR: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/42605

app/views/layouts/nav/_dashboard.html.haml

@@ -3,7 +3,7 @@
 %ul.list-unstyled.navbar-sub-nav
   - if dashboard_nav_link?(:projects)
     = nav_link(path: ['root#index', 'projects#trending', 'projects#starred', 'dashboard/projects#index'], html_options: { id: 'nav-projects-dropdown', class: "home dropdown header-projects qa-projects-dropdown", data: { track_label: "projects_dropdown", track_event: "click_dropdown", track_value: "" } }) do
-      %button.btn{ type: 'button', data: { toggle: "dropdown" } }
+      %button{ type: 'button', data: { toggle: "dropdown" } }
         = _('Projects')
         = sprite_icon('angle-down', css_class: 'caret-down')
       .dropdown-menu.frequent-items-dropdown-menu
@@ -11,7 +11,7 @@
 
   - if dashboard_nav_link?(:groups)
     = nav_link(controller: ['dashboard/groups', 'explore/groups'], html_options: { id: 'nav-groups-dropdown', class: "d-none d-md-block home dropdown header-groups qa-groups-dropdown", data: { track_label: "groups_dropdown", track_event: "click_dropdown", track_value: "" } }) do
-      %button.btn{ type: 'button', data: { toggle: "dropdown" } }
+      %button{ type: 'button', data: { toggle: "dropdown" } }
         = _('Groups')
         = sprite_icon('angle-down', css_class: 'caret-down')
       .dropdown-menu.frequent-items-dropdown-menu

changelogs/unreleased/250685-fix-carets.yml

+---
+title: Fix caret sizes in navigation
+merge_request: 42605
+author:
+type: fixed