Warn when add_noise runs before set_timesteps

searched issues, related to #15021 but not the same.

add_noise before set_timesteps silently uses the wrong level on a few schedulers, you only notice when training looks off.

TLDR: warn when add_noise runs before timesteps are set.

just a warning + test, no behavior change. happy to send a PR if that sounds right.

version: diffusers main

@TejasS1233

Hi @TejasS1233, are you still planning to send a PR for this? If not, I'd be glad to add the warning in add_noise plus a test.

Yes, still planning to. Just opened #15097 for it.

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