EulerDiscreteScheduler add `rescale_betas_zero_snr` #16021

Job	Run time
Hub tests for models, schedulers, and pipelines	1m 53s
Fast PyTorch Pipeline CPU tests	13m 27s
Fast PyTorch Models & Schedulers CPU tests	3m 35s
LoRA	2m 6s
Fast Flax CPU tests	4m 19s
PyTorch Example CPU tests	6m 11s
	31m 31s

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