Fix pyright type-check errors in E2E tests

- Move json import to module level in test_tool_integration.py to fix 'possibly unbound' error
- Remove unused pytest import from test_pipeline_workflows.py
- Remove unused os import from test_tool_integration.py

These changes address CI linter requirements for proper type safety.

Co-Authored-By: Alex Peng <[email protected]>

Author: devin-ai-integration[bot]

tools/server/tests/e2e/test_pipeline_workflows.py

@@ -8,7 +8,6 @@
 - KV cache behavior validation during extended workflows
 """
 
-import pytest
 from utils import *
 
 

tools/server/tests/e2e/test_tool_integration.py

@@ -8,8 +8,8 @@
 - Tool parameter validation and error handling
 """
 
+import json
 import pytest
-import os
 from utils import *
 
 
@@ -280,7 +280,6 @@ def test_cli_json_output_format(pipeline_process, e2e_small_model_config):
     output = result.stdout.decode()
 
     try:
-        import json
         json.loads(output)
     except json.JSONDecodeError:
         pass