Delete cccl_adaptors.hpp and use raw CCCL resource_ref types

Replace RMM's wrapper types (cccl_resource_ref, cccl_async_resource_ref)
with direct aliases to CCCL's resource_ref and synchronous_resource_ref.
This eliminates the 469-line adaptor layer that was originally needed to
work around shared_resource type-erasure issues.

The wrapper was no longer needed once the CCCL #8037 recursive constraint
cycle was broken via template SFINAE constructors (previous commit).

Additional changes required for compilation without the wrapper:
- per_device_resource: static_cast<any_device_resource>(ref) replaced
  with any_device_resource{ref} (wrapper had operator any_resource)
- cuda_async_memory_resource, cuda_async_managed_memory_resource,
  sam_headroom_memory_resource: copy/move changed from = delete to
  = default (CCCL resource_ref requires copyability; shared_resource
  base already provides correct reference-counted semantics)
- device_check_resource_adaptor (test): template SFINAE constructor
  to break the same CCCL #8037 cycle

Author: bdice