[CUDAX] [CUCO] Use cuda::launch and thread hierarchies in cuco

Depends on #9595

cuCollections data structures rely extensively on the Cooperative Groups APIs.
Although the interface is flexible, the underlying implementation is not always optimal. This can result in suboptimal code generation and increased register pressure.

As we migrate cuco into cudax, we have an excellent opportunity to evaluate the redesigned thread hierarchy APIs, which are expected to address many of the code generation issues found in the previous CG implementation.