Fix failing test with race condition

[Rocketknight1]

The test_push_to_hub_dynamic_processor calls create_repo with a fixed repo name, and often throws an error in the CI. I suspect this happens when multiple test runners try to create the repo at the same time.

I rewrote the test to use a randomized repo name, which should hopefully avoid these collisions - though I don't know how the dummy user works, so I hope these still get cleaned up!

[HuggingFaceDocBuilderDev]

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[Rocketknight1]

Ready for review @amyeroberts! In case you're worried about the try/finally thing, or clogging up the dummy user, see this discussion.

[amyeroberts]

Thanks for handling @Rocketknight1

c.f. #31973 #32025 cc @ydshieh

[ArthurZucker]

Finally!

[ydshieh]

Thanks for handling @Rocketknight1

c.f. #31973 #32025 cc @ydshieh

Thank you. I didn't touch anything about test_processor_auto and didn't add any new create_repo. But yes, probably I forgot to use finally.

Anyway, I will rework this kind of thing in #32025