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_integration.py

@@ -1,4 +1,3 @@
-import pytest
 import tempfile
 import os
 from unittest.mock import patch