Mamba Testing

[EveningStarlight]

in mamba 2.0: https://github.com/mamba-org/mamba/releases/tag/2024.09.25
it was updated so that it no longer is considered a python package.

This means that the current testing python -c "import mamba" will fail. This occurs only in remote-desktop, as it downloads the latest mamba. Other packages rely on the upstream quay.io/jupyter/datascience-notebook:2024-06-17`
This error can be fixed by adding mamba to the package exclusion list in the test files. Which will be done for the new infrastructure.

In the future, a new test should be created to test mamba itself.