Resolves#41478
- Generic changes file for the whole feature included in a previous PR.
- Tested with new changes in the proxy merged in
5a266bfaca.
## Testing
- [X] Added/updated automated tests
- [X] 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
67043f53c9