Fix bug where pagination is still displayed despite all todos marked as done

What does this MR do?

Changes the todo mark all as done button callback to remove pagination and add user friendly text "You're all done!" so that it is consistent with what the page should look like after refreshing

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

Shouldn't be

Why was this MR needed?

Resolve existing UI inconsistency

Screenshots (if relevant)

Before:

After:

Does this MR meet the acceptance criteria?

• CHANGELOG entry added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the style guides
• Branch has no merge conflicts with master (if you do - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #21048 (closed)