Set Flux models to eval mode to restore FP8 performance #10330
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Fixes performance regression introduced in #9854 where the fp8_linear optimization path was being skipped during inference because Flux models were not explicitly set to eval mode.
This increased my Flux workflow's it/s on a 5090 back to 2.75 it/s, up from 1.85 it/s which I was getting on latest master.
Specifically, 7be2b49 was the first commit chronologically where my it/s dropped.