**Related issue:** Resolves#46824
# Checklist for submitter
- [x] Changes file added for user-visible changes in `changes/`,
`orbit/changes/` or `ee/fleetd-chrome/changes`.
## Testing
- [x] QA'd all new/changed functionality manually
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## Summary by CodeRabbit
* **Bug Fixes**
* Fixed an issue where volume purchasing program assignments failed when
"All fleets" was selected; validation and token assignment now treat the
"All fleets" label consistently, preventing errors during configuration
application.
* **Tests**
* Added an end-to-end GitOps test case verifying "All fleets" is
supported for volume purchasing program entries.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Steven Palmesano
20c0963331