Dev/andres&janier/v4.0 logout unused

[aschumann-virtualcable]

This pull request updates the way unused user services are handled for both Linux and Windows OS managers, as well as within the assigned unused worker. The main change is to replace direct service release calls with a more structured logout and release process, ensuring that the logout event is properly logged and that services are released in a way that supports pool caching if available.

Refactoring and behavior changes for unused service handling:

• Both LinuxOsManager and WindowsOsManager now use osmanagers.OSManager.logged_out to log the logout event before releasing the service, instead of calling userservice.release() directly. This makes the logout process more explicit and consistent. [1] [2]
• The release logic is now handled by UserServiceManager.manager().release_from_logout, which manages whether the service is returned to the cache or fully released, depending on pool configuration. [1] [2]
• The assigned unused worker (assigned_unused.py) is updated to use the same logout and release flow, ensuring consistency across the codebase.

Logging and messaging improvements:

• Updated log messages to indicate that services are being "released (logout)" rather than simply "removed," providing clearer context in logs. [1] [2] [3]

Imports and code organization:

• Added imports for UserServiceManager and osmanagers in all affected files to support the new logout and release flow. [1] [2] [3]