Deprecate and remove CUDA-software in CPU prefixes

As discussed with @bedroge we need a concrete approach on how to remove the CUDA software from the CPU prefixes, as we've decided all of that should go into the GPU prefixes.

First, we will create a deprecation message in an LMOD hook (via an Lmod warning). Proposal is to remove by 1st of May 2025. Assuming we get the deprecation message in soon, that'd give people 2 months to fix things.

The deprecation message should provide an alternative. I.e. loading the software on a GPU system for a supported CPU+GPU architecture would work. Otherwise, overriding the CPU and/or GPU architecture could still give you some installation, though overriding the GPU architecture (even by a lower one) may cause failing software.

• Deprecation message in place via LMOD hooks
• Removed CUDA software from CPU prefixes