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Nico f5ca4b5b0d Add Android support for custom host vitals (#49696 )

<!-- Add the related story/sub-task/bug number, like Resolves #123, or
remove if NA -->
**Related issue:** Resolves #49421

Custom host vitals (`$FLEET_HOST_VITAL_<id>`) already worked in scripts
and Apple/Windows configuration profiles, but Android configuration
profiles and managed app configuration explicitly rejected them at
upload to keep parity with `$FLEET_SECRET_*`. This left admins unable to
inject per-host vitals (e.g. an asset tag) into Android MDM
configuration the same way they can for every other platform.

For more context, prior PRs:
- https://github.com/fleetdm/fleet/pull/49334
- https://github.com/fleetdm/fleet/pull/49586

# Checklist for submitter

- [x] Changes file added for user-visible changes in `changes/`,
`orbit/changes/` or `ee/fleetd-chrome/changes`.
See [Changes
files](https://github.com/fleetdm/fleet/blob/main/docs/Contributing/guides/committing-changes.md#changes-files)
for more information.

## Testing

- [x] Added/updated automated tests

- [x] QA'd all new/changed functionality manually

- Created an "Asset tag" host vital.
- Enrolled an Android device.
- Initially the test profile showed as "Failed" because no value was set
for the vital.
- Set a value for the vital, saw that it went from Enforcing to
Verified.

<img width="1446" height="510" alt="Screenshot 2026-07-24 at 8 57 46 AM"
src="https://github.com/user-attachments/assets/c0e2348c-e521-48f3-85cd-6f884689b2cd"
/>
<img width="1520" height="936" alt="Screenshot 2026-07-24 at 8 56 56 AM"
src="https://github.com/user-attachments/assets/169b9545-ec7a-429b-8f45-0e2740f61c77"
/>
<img width="1607" height="1136" alt="Screenshot 2026-07-24 at 8 57
30 AM"
src="https://github.com/user-attachments/assets/a8213745-b224-4a36-a54d-32152a15c377"
/>

Also tested the rejection cases:
- trying to upload a profile with an invalid custom host vital id
(either a non-numeric value, a numeric but non-existent ID, and
referencing a vital as a JSON key instead of a value)
- deleting a vital referenced in a profile



https://github.com/user-attachments/assets/e8b4acde-ddf4-41c0-b00a-5ab4945d0bc2



<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

## Summary by CodeRabbit

* **New Features**
* Android app configurations and profiles now support custom host vital
placeholders (`$FLEET_HOST_VITAL_<id>`).
* Custom host vital values are expanded per device during Android
delivery.
* Managed Android profiles/configurations are automatically resent when
a referenced vital value changes.

* **Bug Fixes**
* Added validation for malformed, missing, or undefined vital references
during Android app association and profile/config uploads.
  * Prevented deletion of vitals referenced by Android profiles.
* Improved error handling and delivery failure details when a device
lacks a required vital value.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->