Adds sprite icon to chevron

Adds a changelog entry

Renames changelog YAML

Merges database schema from master

ee/app/views/dashboard/operations/_nav_link.html.haml

 - if can?(current_user, :read_operations_dashboard)
   %button#js-dashboards-menu.btn-link{ type: 'button', data: { toggle: 'dropdown' }, 'aria-label': _('Operations Dashboard'), 'aria-haspopup': true, 'aria-expanded': false }
     = sprite_icon('dashboard', size: 18)
+    = sprite_icon('angle-down', css_class: 'caret-down')
   .dropdown-menu{ 'aria-labelledby': "js-dashboards-menu" }
     .dropdown-bold-header
       = _('Dashboards')

ee/changelogs/unreleased/14711-dashboards-chevron-ee.yml

+---
+title: Adds a downard chevron to Dashboards icon in the header
+merge_request: 14711
+author:
+type: fixed