fix: remove unused imports in test_rich_live_cleanup.py

Removes unused imports that were causing lint failures:
- logging
- io.StringIO
- unittest.mock.MagicMock
- rich.logging.RichHandler

This fixes the CI lint check failure (job 45782458300).

Co-Authored-By: Jo\u00E3o <joao@crewai.com>

tests/test_rich_live_cleanup.py

@@ -1,7 +1,4 @@
-import logging
-from io import StringIO
-from unittest.mock import MagicMock, patch
-from rich.logging import RichHandler
+from unittest.mock import patch
 from rich.tree import Tree
 from crewai.utilities.events.utils.console_formatter import ConsoleFormatter
 from crewai.utilities.events.event_listener import EventListener