Update CUDA to 12.9 w/ cuda-compat-12-9

[alvarobartt]

What does this PR do?

Warning

This PR is still experimental, until cuda-compat-12-9 is validated against the previously supported CUDA versions until 12.2 to make sure that the compatibility layer is indeed working as expected.

This PR updates the default CUDA version to 12.9.1 in Dockerfile-cuda and Dockerfile-cuda-all to accommodate the CUDA compute capabilities for Blackwell being 10.0 and 12.0, which do require CUDA 12.9. Additionally, this PR also removes the former Dockerfile-cuda-blackwell and Dockerfile-cuda-blackwell-all images as no longer required.

This PR makes sure that a single Dockerfile can build and use all the targets independently of the underlying CUDA version given that it comes with cuda-compat-12-9 which should support 12.2, 12.4, and 12.8.

More information at https://docs.nvidia.com/deploy/cuda-compatibility/forward-compatibility.html#id1

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• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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• Did you write any new necessary tests? If applicable, did you include or update the insta snapshots?

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