Run the `clang-format.bash` script to update all our C and C++ code to a
new style defined by `.clang-format`, now with "east const" enforcement.
Use `clang-format` version 18.
* If you reached this commit for a line in `git blame`, re-run the blame
operation starting at the parent of this commit to see older history
for the content.
* See the parent commit for instructions to rebase a change across this
style transition commit.
Issue: #26123
Convert the `CudaOnly.LinkSystemDeviceLibraries` test to a new
`Cuda.ProperDeviceLibraries` test. The former covered only the
`cublas_device` library which is removed by CUDA 10. Extend the new
test to also cover various cases of using threads.
Issue: #18008