Frontend: Windows managed local account (#50241)

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**Related issue:** Resolves #48722 

Demo: https://www.youtube.com/watch?v=zm5WmJY-o4Y

# 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`.

## Testing

- [x] Added/updated automated tests
- [x] QA'd all new/changed functionality manually

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **New Features**
* Added Windows support for creating and managing local administrator
accounts.
* Added a Windows-specific option in user setup when Windows MDM is
configured.
* Added managed-account actions and status visibility for Windows hosts.
* Added guidance noting that this feature requires `fleetd` 1.60.0 or
later.

* **Improvements**
* Updated local account descriptions, help text, and authentication
guidance.
  * Improved managed-account status and password-rotation messaging.
* Added clearer feedback when account creation or password escrow is
pending.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

changes/43488-windows-admin-account

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+- Added the ability to create a managed local admin account on Windows hosts. Requires fleetd 1.60.0 or higher.