Fix remaining lint issues with noqa comments

- Add noqa: F401 to integrations import in __init__.py
- Add noqa: F401 to mlflow import in integrations/__init__.py

These imports are intentionally unused as they trigger MLflow patching
and integration setup when the module is imported.

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

src/crewai/__init__.py

@@ -34,6 +34,6 @@ __all__ = [
 ]
 
 try:
-    from . import integrations
+    from . import integrations  # noqa: F401
 except ImportError:
     pass

src/crewai/integrations/__init__.py

@@ -1 +1 @@
-from . import mlflow
+from . import mlflow  # noqa: F401