feat: enhance E2E testing setup and model reporting

- Added a new fixture to manage runtime report artifacts in a writable temp directory during E2E tests, addressing permission issues in local CI/dev environments.
- Updated `conftest.py` to include a requirements.txt file in the model packaging path for training activities.
- Refactored existing fixtures to use `pytest.fixture` instead of `pytest_asyncio.fixture` for better compatibility.
- Enhanced the `Reports` class to include a target alias for report metrics, ensuring compatibility with Evidently's reporting requirements.
- Introduced new test scenarios to validate the handling of missing and whitespace-only `date_column` inputs in the training workflow.

These changes improve the robustness of the E2E testing framework and enhance the clarity of model reporting metrics.

tests/workflows/test_train_model.py

@@ -3,6 +3,7 @@
 from unittest.mock import AsyncMock, Mock, patch
 
 import pytest
+from temporalio.exceptions import ApplicationError
 
 from model_manager.utils.models.experiment_status import ExperimentStatus
 from model_manager.utils.models.train_model_params import TrainModelParams
@@ -295,7 +296,7 @@ async def test_run_missing_experiment_run_id(mock_wf):
     from model_manager.workflows.train_model import TrainModel
 
     mock_wf.logger = Mock()
-    with pytest.raises(ValueError, match='experiment_run_id is required'):
+    with pytest.raises(ApplicationError, match='experiment_run_id is required'):
         await TrainModel().run({})