Added logic to `menu.go` to detect when Fleet Desktop is running on OpenSUSE in order to display text correctly in the system tray menu.
---------
Co-authored-by: Lucas Manuel Rodriguez <lucas@fleetdm.com>
Fixes#31129
Also refactored some of the menu code into its own package with tests.
# Checklist for submitter
- [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
## fleetd/orbit/Fleet Desktop
- [x] Verified compatibility with the latest released version of Fleet
(see [Must
rule](https://github.com/fleetdm/fleet/blob/main/docs/Contributing/workflows/fleetd-development-and-release-strategy.md))
- [x] Verified that fleetd runs on macOS, Linux and Windows
- [x] Verified auto-update works from the released version of component
to the new version (see [tools/tuf/test](../tools/tuf/test/README.md))
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Bug Fixes**
* The "Self-service" option in the Fleet Desktop menu is now hidden when
the device is offline.
* **Refactor**
* The Fleet Desktop menu system has been restructured for improved
reliability and maintainability. Menu items are now managed through a
unified menu manager, resulting in a cleaner and more consistent user
experience.
* **New Features**
* Introduced a new menu manager to dynamically update menu items based
on connection status and device policies.
* Added a system tray menu factory for consistent menu item creation and
interaction.
* **Tests**
* Added comprehensive tests to ensure correct menu behavior and state
transitions.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
