[WIP] change to cross nic=2 to allow for alternating ring algo and nccl==2.23.4

[OrenLeung]

• change to NCCL_CROSS_NIC=2
• update from very old nccl==2.19.4 in ngc 24.01 to nccl==2.23.4 in ngc 24.12
• change to QPS_PER_CONNECTION=1 when within the same rail group as there is no hash collisions within the same rail group
• TODO: add note about needing more QPs when about 1 tier of switching to increase enthropy
• remove nccl topo since NCCL graph search should be able to auto generate the topo on OCI's bare metal instances
• remove NCCL_NET_PLUGIN=none

max BW with alternating ring is 390GByte/s without it is 370GByte/s according to Sylvain's GTC24 NCCL talk

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