Resolves#47699.
- [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
* **New Features**
* Microsoft Entra Conditional Access is now supported for self-hosted
Fleet Premium instances.
* Conditional Access is available only on the Fleet Premium license
tier.
* **Changes**
* Removed the Microsoft Compliance Partner API key configuration and
updated the proxy behavior accordingly.
* Removed the managed-cloud indicator from license/config responses and
adjusted related UI rendering and gating.
* **Tests / Maintenance**
* Updated fixtures and automated tests to reflect the new licensing
gates and API/proxy behavior (including updated failure codes).
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Lucas Manuel Rodriguez
da3f30df79