Merge branch 'api-delete-todos' into 'master'

Api delete todos

## What does this MR do?

It changes the `DELETE /todos` to only return the number of marked todos.

## Why was this MR needed?

Before it returned the marked todos as an paginated array. Since we deleted/marked the todos, there was no way to get the rest of the todos.

## What are the relevant issue numbers?

Closes #19678

## Does this MR meet the acceptance criteria?

~~- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added~~
- [x] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [x] API support added
- Tests
  - [x] Added for this feature/bug
  - [x] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !5341

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/api/todos.rb b/lib/api/todos.rb
index 2a6bfa98ca4..26c24c3baff 100644
--- a/lib/api/todos.rb
+++ b/lib/api/todos.rb
@@ -75,7 +75,7 @@ module API
         todos = find_todos
         todos.each(&:done)
 
-        present paginate(Kaminari.paginate_array(todos)), with: Entities::Todo, current_user: current_user
+        todos.length
       end
     end
   end