[mxfp8 moe training] remove outdated example

[danielvegamyhre]

Stacked PRs:

• [mxfp8 moe training] fix bug in bench_ep_pipeline script #3753
• [mxfp8 moe training][docs] add tutorial for training with MXFP8 expert parallel #3752
• [mxfp8 moe training] add MXFP8 expert parallel example #3751
• ->[mxfp8 moe training] remove outdated example #3750

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[mxfp8 moe training] remove outdated example

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/ao/3750

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