ToDo: Fix count when not filtered

What does this MR do and why?

This MR adds a fix to show the correct count when ToDo's are not filtered and there are more than 20 open ToDos (paging).
It also adds a readable empty message if no results have been found.

Screenshots or screen recordings

Before	After
Count with multiple pages	Count with multiple pages
Filtered results count	Filtered results count
Filtered results empty message	Filtered results empty message

How to set up and validate locally

1. http://gdk.test:3000/dashboard/todos should show total of all open ToDos
2. Filter ToDos
3. Count should change to count of filtered results
4. Filter again until no results are found
5. A message should appear that no results have been found

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to UX Paper Cuts 16.5 → Cleanup (#424403 - closed), ToDo badge: Fix count when list is filtered (!132510 - merged)

Closes #427152 (closed)