Update MinIO #980 #982 #983 #984

To be completed:

• Update MinIO #980 (closed)
• #982 (closed)
• #983 (closed)
• Introduce minio-mirror image to provide minio bucket data to volume mounts
• Adjust landingpage to provide thumbnails from mirrored minio bucket #984 (closed)
• Adjust staticwebisteresults to provide files from mirrored minio bucket
• Adjust applications to get filesystem data from mirrored minio buckets:
  • tensorboard
  • jupyterlab
  • mitk-workbench
  • slicer
• Run containers for landing-page, staticwebsiteresults, jupyterlab and tensorboard as non-root users
• Implement impersonation and authorization mechanism in HelperMinio.py and adjust kaapana-backend and operators.
• Remove jupyterlab from base-python-cpu image
• Remove hints for dev_server="jupyterlab" from KaapanaBaseOperator
• Remove option use_minio_mount from KaapanaFederated class and operators that have been using it.
• Introduce JupyterlabReportingOperator
• Adjust radiomics-federated, nnunet-training and nnunet-ensemble to use JupyterLabReportingOperator instead of custom processing-operators.