UCT/IB: Support cuda-managed memory when ODP is available

[tvegas1]

What

Allow memory registration for cuda-managed memory when ODP is enabled on machines with coherent memory.

Why ?

Needed to enable rdma, avoiding long-term page pinning.

How ?

Advertise support, and make sure non-blocking registration is always requested for cuda-managed, since it currently fails otherwise.

Test

mpirun -mca coll ^hcoll -mca pml ucx -np 2 osu_bw -d managed MD MD
./bin/ucx_perftest -m cuda-managed -t <tag_bw|ucp_put_bw|ucp_get>

• Confirmed actual RDMA operation against cuda-managed memory with ODPv1
• enable rdma assertion on gtest
• tested on GH200 / A100 without coherent.
• tested with UCX_IB_ODP_PREFETCH=y