Add Unified Sequence Parallel attention #35968

Job	Run time
check_code_quality	32s
check_repository_consistency	31s
LoRA tests with PEFT main	5m 31s
Hub tests for models, schedulers, and pipelines	1m 33s
PyTorch Example CPU tests	18m 2s
Fast PyTorch Pipeline CPU tests	13m 48s
Fast PyTorch Models & Schedulers CPU tests	2m 54s
	42m 51s

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