catch2_test_device_segmented_reduce_iterators_64bit.cu does not compile with CUB_CONFIG_MAIN defined.

The culprit is the direct inclusion of ``:
https://github.com/NVIDIA/cccl/blob/1f87d3d4d1e93e066deb3f57ea1d4bad3fa5f6ed/cub/test/catch2_test_device_segmented_reduce_iterators_64bit.cu#L34

It results in the header being included with `CATCH_CONFIG_RUNNER` undefined, and that breaks `catch2_main.cuh` which needs to include catch.hpp with `CATCH_CONFIG_RUNNER`, but it's too late now.
https://github.com/NVIDIA/cccl/blob/1f87d3d4d1e93e066deb3f57ea1d4bad3fa5f6ed/cub/test/catch2_main.cuh#L38

`CATCH_CONFIG_RUNNER` should probably be done globally on the build level. Otherwise the compilation results will depend on which source file happened to include the catch header first, and which options were defined at that time.