Remove RHOAI dependency

[brianjball]

Right now I'm using RHOAI as a crutch: in order to create the MinIO bucket, we need an image that has oc and python installed on it. The current solution is to use one of the base workbench images from RHOAI.

See https://github.com/redhat-na-ssa/mlflow-on-ocp/blob/main/manifests/minio_s3.yaml#L270

If everything is done right, you should be able to just swap out the image, and maybe pip install boto3 before line 249.