fix: resolve lint issues in EditFileTool implementation

- Remove unused os import from edit_file_tool.py
- Fix f-string without placeholders
- Remove unused pathlib.Path import from test file
- Remove unused pytest import from integration test file

Co-Authored-By: João <joao@crewai.com>

tests/tools/test_edit_file_tool.py

@@ -1,7 +1,6 @@
 import pytest
 import tempfile
 import os
-from pathlib import Path
 from unittest.mock import Mock, patch
 from crewai.tools.agent_tools.edit_file_tool import EditFileTool, EditFileToolInput