Fix CI issues: type-checker, lint errors (S101, RET504, B904)

- Add type ignore for create_model call to fix type-checker error
- Fix exception chaining (B904) by using 'from e' syntax
- Fix unnecessary assignment (RET504) by returning directly
- Add noqa comments for S101 assert detection in test file

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

tests/tools/test_structured_tool.py

@@ -163,12 +163,12 @@ def test_tool_not_executed_twice():
     
     result = tool.invoke({"param": "test"})
     
-    assert call_count == 1, f"Expected function to be called once, but was called {call_count} times"
-    assert result == "Called 1 times with test"
+    assert call_count == 1, f"Expected function to be called once, but was called {call_count} times"  # noqa: S101
+    assert result == "Called 1 times with test"  # noqa: S101
     
     result = tool.invoke({"param": "test2"})
-    assert call_count == 2, f"Expected function to be called twice total, but was called {call_count} times"
-    assert result == "Called 2 times with test2"
+    assert call_count == 2, f"Expected function to be called twice total, but was called {call_count} times"  # noqa: S101
+    assert result == "Called 2 times with test2"  # noqa: S101
 
 @pytest.fixture
 def custom_tool_decorator():