Tests

Add `ModelSamplingDiscreteFlow`, `SD3LatentFormat` and `CFGDenoiser` #9335

Job	Run time
Test the code with Keras 2	2m 30s
Check the code format	2m 20s
Test the code with Keras 3 (tensorflow)	5m 6s
Test the code with Keras 3 (jax)	6m 14s
Test the code with Keras 3 (torch)	5m 32s
	21m 42s

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