Fleet UI: macOS dashboard MDM solutions

[RachelElysia]

Cerra #6928

New feature

• See specs in 6928

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/ and/or orbit/changes/).
• [ ] Added/updated tests
• [x] Manual QA for all new/changed functionality