feat: update values.yaml and refactor cleanup paths

- Changed project name in values.yaml from "sientia-dataops-model-manager" to "sientia-model-manager".
- Added new environment variables for GitHub repository and branch configuration.
- Refactored cleanup paths to use a centralized REPORTS_TEMP_DIR constant for consistency.
- Updated runtime configurations and adjusted volume mounts for better resource management.
- Enabled SSH access for the model manager and disabled Grafana dashboard creation.
- Updated tests to reflect changes in directory paths and environment variable usage.

tests/utils/repository/test_data_manager_repository.py

@@ -10,6 +10,7 @@ import numpy as np
 import pandas as pd
 import pytest
 
+from model_manager.runtime_paths import REPORTS_ROOT
 from model_manager.utils.models.train_model_params import TrainModelParams
 from model_manager.utils.models.train_model_result import TrainModelResult
 from model_manager.utils.repository import data_manager_repository as dmr
@@ -475,5 +476,4 @@ def test_extract_model_equation_more_features_than_coefficients():
 def test_get_reports_directory_path():
     repo = dmr.DataManagerRepository(MagicMock())
     reports_dir = repo._get_reports_directory()
-    assert reports_dir.endswith('reports')
-    assert 'model_manager' in reports_dir
+    assert reports_dir == REPORTS_ROOT