[GFI] Improve Vehicle Device Management

[roncodes]

Description:
Enhance the vehicle device management system to improve data integrity and usability.

Tasks:

• Add validation rules to ensure proper data consistency when attaching devices.
• Exclude devices that are already attached to other vehicles from the "Attach Device" dropdown or modal.
• Extend the functionality to support attaching sensors to vehicles as well.
• Update the UI to reflect new device and sensor relationships.
• Ensure backend validation prevents duplicate device assignments.

Acceptance Criteria:

• Users cannot attach the same device to multiple vehicles.
• Sensors can be attached and displayed similar to devices.
• Proper validation and error messages are shown to the user.

References:

• Related models: Device, Sensor, Vehicle.
• Relevant components: Device::Manager, Modals::AttachDevice.