feat: update environment configuration and remove deprecated model serving

- Modified `.env.example` to set local defaults for PostgreSQL, MLflow, and MinIO configurations.
- Added MongoDB configuration parameters to the environment setup.
- Updated `README.md` to reflect changes in workflow input parameters and task queue naming conventions.
- Removed the `ModelServing` class to streamline the codebase, as it was deemed unnecessary.
- Adjusted `connectors_config.py` to align with new environment variable names and improve clarity.
- Updated tests to reflect changes in configuration handling and removed tests related to the deleted `ModelServing` class.

values.yaml

@@ -150,7 +150,7 @@ global:
       value: "modelTrainingUser123"
     - name: MINIO_REGION
       value: "us-east-1"
-    - name: MINIO_USE_SSL
+    - name: MINIO_SECURE
       value: "false"
     - name: MINIO_MAX_RETRY_ATTEMPTS
       value: "3"