relates to #10786
This fixes an issue where users would see the incorrect disk encryption
banners on the my device page. This included a change to the ingestion
logic of the `directIngestDiskEncryptionKeyDarwin` method to take into
account if a host was already being encrypted with filevault locally.
- [x] Changes file added for user-visible changes in `changes/` or
`orbit/changes/`.
See [Changes
files](https://fleetdm.com/docs/contributing/committing-changes#changes-files)
for more information.
- [x] Added/updated tests
- [x] Manual QA for all new/changed functionality
