[tests] Pipeline test refactor #40003

Job	Run time
check_code_quality	33s
check_repository_consistency	36s
Hub tests for models, schedulers, and pipelines	3m 35s
LoRA tests with PEFT main	5m 19s
Fast PyTorch Pipeline CPU tests	5m 16s
Fast PyTorch Models & Schedulers CPU tests	5m 21s
PyTorch Example CPU tests	5m 19s
	25m 59s

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