Merge topic 'ci-fedora-40'

acf1179e74 ci: Verify that C++26 modes work with GCC and Clang on Fedora
b05f94fa10 ci: Enable FindOpenACC tests in LLVM/Clang jobs on Fedora
c722bde0e3 ci: Enable FindOpenACC test for each language independently
b84b0fdd89 ci: Enable FindOpenMP tests in LLVM/Clang jobs on Fedora
4590255c63 ci: Subsume GCC C++ modules testing in main Fedora jobs
9c004ddb3d ci: use Fedora 40 images and environments
0f56cc9a4e ci: update Linux image to Fedora 40
21ef873660 clang-tidy module: Update to build against LLVM/Clang 18
...

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !9462