Add results counter for BatchOperations list

Problem/Motivation

The original design ✨ UX design for script run sub-module Active for the BatchOperations list called out the need for a results counter.
https://www.drupal.org/files/issues/2024-05-14/batch-operations-list.png →

This issue is to cover adding the results counter.
This might be tied into adding pagination.

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes