Migrate chevron-down icon to svg

- runner page
- epic page

app/views/admin/runners/_sort_dropdown.html.haml

@@ -3,7 +3,7 @@
 .dropdown.inline.gl-ml-3
   %button.dropdown-menu-toggle{ type: 'button', data: { toggle: 'dropdown', display: 'static' } }
     = sorted_by
-    = icon('chevron-down')
+    = sprite_icon('chevron-down', css_class: 'dropdown-menu-toggle-icon gl-top-3')
   %ul.dropdown-menu.dropdown-menu-right.dropdown-menu-selectable.dropdown-menu-sort
     %li
       = sortable_item(sort_title_created_date,   page_filter_path(sort: sort_value_created_date),   sorted_by)

changelogs/unreleased/224509-chevron-down-svg-runner-epic.yml

+---
+title: Migrate chevron-down icon to svg
+merge_request: 47591
+author:
+type: other

ee/app/views/shared/epic/_sort_dropdown.html.haml

@@ -5,7 +5,7 @@
   .btn-group.d-flex.d-md-inline-flex
     %button.btn.dropdown-toggle.epics-sort-btn{ type: 'button', data: { toggle: 'dropdown' } }
       = sorted_by
-      = icon('chevron-down')
+      = sprite_icon('chevron-down', css_class: 'gl-text-gray-200')
     %ul.dropdown-menu.dropdown-menu-right.dropdown-menu-selectable.dropdown-menu-sort
       %li
         - if !hide_extra_sort_options

ee/app/views/shared/epic/_state_dropdown.html.haml

 .dropdown.inline.dropdown-epics-state
   %button.dropdown-toggle{ type: 'button', data: { toggle: 'dropdown' } }
     = epic_state_title(@epics_state)
-    = icon('chevron-down')
+    = sprite_icon('chevron-down', css_class: 'gl-text-gray-200')
   %ul.dropdown-menu.dropdown-menu-selectable
     %li
       = epic_state_dropdown_link('all', @epics_state)