Merge branch '230777-migrate-haml-nav-to-gltabs' into 'master'

Convert markdown field tabs to pajamas

See merge request gitlab-org/gitlab!73987

app/views/shared/_md_preview.html.haml

@@ -9,7 +9,7 @@
 
 .md-area.position-relative
   .md-header
-    %ul.nav.nav-tabs.nav-links.clearfix
+    = gl_tabs_nav({ class: 'clearfix nav-links'}) do
       %li.md-header-tab.active
         %button.js-md-write-button
           = _("Write")