Unit Tests for wazuh-agent status app

## Description
The wazuh-agent status app is a tray icon utility that monitors whether the Wazuh agent is active and connected. To ensure reliability and maintainability, this issue proposes the creation of unit tests for the app's core functionalities, including agent status detection, tray icon updates, and connectivity checks.

## Definition of Ready
- [ ] Source code for the tray app is available and accessible
- [ ] Testing framework is selected and configured (e.g., pytest, unittest)
- [ ] Key functionalities to be tested are identified
- [ ] Mocking strategy for agent status and connectivity is defined

## Acceptance Criteria
- [ ] Unit tests cover all major functions of the tray app
- [ ] Tests simulate agent running, stopped, and disconnected states
- [ ] Tray icon behavior is validated under different conditions
- [ ] Tests run successfully in CI/CD pipeline (if applicable)
- [ ] Test coverage report is generated and reviewed

## Definition of Done
- [ ] Unit tests are implemented and pass consistently
- [ ] Code is reviewed and merged
- [ ] Coverage meets the team's quality threshold
- [ ] Documentation is updated to include testing instructions
- [ ] Stakeholders are informed of the test coverage and reliability improvements