<!-- Add the related story/sub-task/bug number, like Resolves#123, or
remove if NA -->
**Related issue:** Resolves#35805
Fixed to make sure software host counts tables never have host counts of
0.
Planning to loadtest this fix along with the follow up fix for
https://github.com/fleetdm/fleet/issues/35799
# Checklist for submitter
- [x] Changes file added for user-visible changes in `changes/`,
`orbit/changes/` or `ee/fleetd-chrome/changes`.
## Testing
- [x] Added/updated automated tests
- [x] QA'd all new/changed functionality manually
<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit
* **Bug Fixes**
* Fixed accumulation of dead rows in software host count tracking,
improving data accuracy and system performance.
* Enhanced validation to ensure consistent and reliable software
availability records.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Victor Lyuboslavsky
6110e3d5d3