Merge topic 'ci-cuda-12.6'

7f1250ca68 ci: Drop redundant job testing cuda12.2 with nvcc -ccbin=clang++-18
1ffa199c55 ci: add jobs testing cuda12.6 with nvcc and clang 18
07ddceea84 ci: add cuda12.6 base image

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !10261