<!-- Add the related story/sub-task/bug number, like Resolves#123, or
remove if NA -->
**Related issue:** Resolves#43389
1. Added verifyPatchPolicy check
2. Fixed nil pointer dereference when calling spec/policies with no
fleet_maintained_app_slug key provided
3. Fixed bug where renaming a patch policy in a gitops file caused it to
be deleted on the first run, and only added when gitops is run again.
# Checklist for submitter
If some of the following don't apply, delete the relevant line.
- [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
- [ ] Where appropriate, [automated tests simulate multiple hosts and
test for host
isolation](https://github.com/fleetdm/fleet/blob/main/docs/Contributing/reference/patterns-backend.md#unit-testing)
(updates to one hosts's records do not affect another)
- [x] QA'd all new/changed functionality manually
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Bug Fixes**
* Renaming a patch policy via GitOps now updates the existing policy
instead of deleting it.
* Fixed nil-pointer errors in policy API operations.
* Reject applying patch policies with missing, invalid, or disallowed
Fleet Maintained App references (including global/enterprise slugs).
* Improved matching for patch policies to avoid unintended deletions
when names differ.
* Patch policies now preserve intended platform/target behavior during
apply/update.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
