Re-enable tests which were failing on #3373

[mathemakitten]

What does this PR do ?

We disabled these tests to merge #3373 and they need to be re-enabled.

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[svcnvidia-nemo-ci]

🔄 Merge queue validation started!

You can track the progress here: https://github.com/NVIDIA/Megatron-LM/actions/runs/22870341173

[svcnvidia-nemo-ci]

🔄 Merge queue validation started!

You can track the progress here: https://github.com/NVIDIA/Megatron-LM/actions/runs/22876597761