Move todos empty state icons

What does this MR do?

With recent changes to DRYing up the empty states, the todo icons must be moved.

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Changelog entry added
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

app/views/dashboard/todos/index.html.haml

@@ -81,7 +81,7 @@
     = paginate @todos, theme: "gitlab"
   - elsif current_user.todos.any?
     .todos-all-done
-      = render "shared/empty_states/todos_all_done.svg"
+      = render "shared/empty_states/icons/todos_all_done.svg"
       - if todos_filter_empty?
         %h4.text-center
           = Gitlab.config.gitlab.no_todos_messages.sample
@@ -98,7 +98,7 @@
   - else
     .todos-empty
       .todos-empty-hero
-        = render "shared/empty_states/todos_empty.svg"
+        = render "shared/empty_states/icons/todos_empty.svg"
       .todos-empty-content
         %h4
           Todos let you see what you should do next.