[tests] test_mlflow_manager fails on Python 3.12 because __builtins__ is a dict

[nguyenhuulocbb]

Describe the bug

Running the test suite on macOS with Python 3.12 causes an INTERNALERROR in
tests/unit/test_mlflow_manager.py due to the use of:

__builtins__.__import__

In Python 3.12 on macOS, __builtins__ is a dict, not a module, so it has no __import__ attribute.
This causes pytest to crash during test collection.

After replacing it with builtins.__import__ (which always exists), the INTERNALERROR disappears, but the test test_mlflow_manager_enabled_no_mlflow_package then fails normally — which is expected and indicates that the underlying logic can now be tested correctly.

Environment
	•	OS: macOS (Apple Silicon)
	•	Python: 3.12.x
	•	ROMA: main branch (commit: <paste your git rev-parse HEAD here>)
	•	Install: pip install -e ".[api]" in a fresh virtualenv

Steps to reproduce

git clone https://github.com/sentient-agi/ROMA.git
cd ROMA
python3.12 -m venv .venv
source .venv/bin/activate
pip install --upgrade pip
pip install -e ".[api]"

pytest tests/unit/test_mlflow_manager.py -q

Actual behavior

Pytest crashes with:

AttributeError: 'dict' object has no attribute '__import__'
  File "tests/unit/test_mlflow_manager.py", line 50, in mock_import
    return __builtins__.__import__(name, *args, **kwargs)
Expected behavior

The test should not cause an INTERNALERROR.
It should fail or pass normally depending on the logic being tested.

Proposed fix

Replace __builtins__.__import__ with builtins.__import__, which is stable across environments.

Example patch:

import builtins

_real_import = builtins.__import__

def mock_import(name, *args, **kwargs):
    if name == "mlflow":
        raise ImportError("mlflow not installed")
    return _real_import(name, *args, **kwargs)