Update HPC rules

[sparticlesteve]

Updating CosmoFlow target and number of runs.

Clarifying rule on data state at start of run to explicitly mention consistency with Training rule allowance on data reformatting.

Note: CLA signing is in progress. If that's an obstacle, perhaps @TheKanter could do this for me.

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[sparticlesteve]

Actually, I forgot this repo requires the Google CLA. I'm working on signing the MLCommons one, so I probably need someone else to make this update.