For #26996 and #28452
Demo video: https://www.youtube.com/shorts/WGS3JmKiZTs
The device/machine info is extracted from the PKCS7 signed body of the
POST request.
I did manual QA on iPhone since I don't have an ADE macOS device with
me.
# Checklist for submitter
- [x] Changes file added for user-visible changes in `changes/`,
`orbit/changes/` or `ee/fleetd-chrome/changes`.
- [x] Input data is properly validated, `SELECT *` is avoided, SQL
injection is prevented (using placeholders for values in statements)
- [x] Added/updated automated tests
- [x] Manual QA for all new/changed functionality