Extract method to render an admin table action

This way it will be easier to change the behavior of all table actions,
like adding ARIA attributes. In the past, when we changed the behavior
of the `link_to` method, we had to change all table action classes.

app/components/admin/budget_groups/groups_component.rb

@@ -1,4 +1,5 @@
 class Admin::BudgetGroups::GroupsComponent < ApplicationComponent
+  include Admin::Namespace
   attr_reader :groups
 
   def initialize(groups)
@@ -11,7 +12,7 @@ class Admin::BudgetGroups::GroupsComponent < ApplicationComponent
       @budget ||= groups.first.budget
     end
 
-    def headings_path(table_actions_component, group)
-      send("#{table_actions_component.namespace}_budget_group_headings_path", group.budget, group)
+    def headings_path(group)
+      send("#{namespace}_budget_group_headings_path", group.budget, group)
     end
 end