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fix: mount /dev/shm as emptyDir to fix NCCL shared memory exhaustion

NCCL proxy service allocates ~33MB per communicator in /dev/shm. The
default Kubernetes /dev/shm is 64MB (Docker default), which is
insufficient for workloads that create multiple NCCL communicators.
Patch ClusterTrainingRuntimes in GPU e2e setup to mount /dev/shm as
a Memory-backed emptyDir, and remove unnecessary NCCL workaround
env vars from the Megatron notebook.

Signed-off-by: XploY04 <2004agarwalyash@gmail.com>