fix(training): fail fast on malformed launcher rank (#5766) #20945

Job	Run time
pre-flight / pre-flight	14s
configure	6s
Lint check	24s
cicd-compute-build-matrix	3s
cicd-wait-in-queue	-1s
cicd-container-build (gcp, us-east4-docker.pkg.dev/nv-projdgxchipp-20260113193621/megatron-bridge...	3m 39s
cicd-container-build (aws, 766267172432.dkr.ecr.us-east-1.amazonaws.com, nemo-ci-aws-gpu-x2)	4m 46s
generate-test-matrix	8s
Launch_Unit_Tests_Diffusion	1m 8s
Launch_Unit_Tests_Core_1	1m 8s
generate-gb200-test-matrix	7s
Launch_Import_Check	1m 8s
Launch_Unit_Tests_Core_0	1m 8s
Launch_Unit_Tests_Core_2	1m 8s
gb200_${{ matrix.script }}	1s
matrix.script	1s
matrix.script	1s
gb200_${{ matrix.script }}	1s
gb200_${{ matrix.script }}	1s
matrix.script	1s
gb200_${{ matrix.script }}	1s
matrix.script	1s
Nemo_CICD_Test	1s
Coverage	1s
Coverage_Fake	1s
	15m 17s

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