[https://nvbugs/6631019][test] reset compile mode in reused MPI workers + unwaive Nemotron Nano FP8 CUDA graph test on DGX B200 - #17931

[https://nvbugs/6631019][test] reset compile mode in reused MPI workers + unwaive Nemotron Nano FP8 CUDA graph test on DGX B200#17931

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