Conver create merge request button to gl

app/views/projects/compare/_form.html.haml

@@ -28,4 +28,4 @@
   - if @merge_request.present?
     = link_to _("View open merge request"), project_merge_request_path(@project, @merge_request), class: 'gl-ml-3 btn'
   - elsif create_mr_button?
-    = link_to _("Create merge request"), create_mr_path, class: 'gl-ml-3 btn'
+    = link_to _("Create merge request"), create_mr_path, class: 'gl-ml-3 btn gl-button'

changelogs/unreleased/231207-convert-compare-button-to-gl.yml

+---
+title: Conver create merge request button to gl
+merge_request: 49864
+author:
+type: other