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>

src/crewai/tools/agent_tools/edit_file_tool.py

@@ -2,7 +2,6 @@ from crewai.tools import BaseTool
 from crewai.llm import LLM
 from typing import Type, Optional
 from pydantic import BaseModel, Field
-import os
 from pathlib import Path
 
 
@@ -63,7 +62,7 @@ class EditFileTool(BaseTool):
             new_content = self._extract_file_content(response)
             
             if new_content is None:
-                return f"Error: Failed to generate valid file content. LLM response was malformed."
+                return "Error: Failed to generate valid file content. LLM response was malformed."
             
             backup_path = f"{file_path}.backup"
             with open(backup_path, 'w', encoding='utf-8') as f:

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
 

tests/tools/test_edit_file_tool_integration.py

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