Add Integrational Tests

[ipetrushchak]

• Added error handling tests to simulate and handle possible errors or exceptions from the ReportPortal service.
• Added parameterized tests using @pytest.mark.parametrize for methods that can accept a wide range of inputs.
• Ensured cleanup and teardown using pytest fixtures with finalizers or the teardown_method.
• Added integration tests that interact with a mock or test instance of the ReportPortal service to validate the integration points more thoroughly.

This PR enhances the test coverage and robustness of the ReportPortal client integration.