## Summary

Changed the list of agent versions to agent count per version in
fleet-usages telemetry as requested
[here](elastic#145353 (comment)).

### Checklist

- [x] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios

(cherry picked from commit e771fc8)

#147169)

# Backport

This will backport the following commits from `main` to `8.6`:
- [changed agent versions to agents per version telemetry
(#147164)](#147164)

<!--- Backport version: 8.9.7 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

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Co-authored-by: Julia Bardi <90178898+juliaElastic@users.noreply.github.com>
Co-authored-by: Julia Bardi <julia.bardi@elastic.co>