[FSDP][Easy] ufmt files

[awgu]

Stack from ghstack:

• [Composable API][Easy] Use policy=None since that is supported #90400 [Composable API][Easy] Use policy=None since that is supported
• [Composable API] Match fully_shard() comm. schedule with wrapper FSDP #90387 [Composable API] Match fully_shard() comm. schedule with wrapper FSDP
• [Composable API] Refactor test_fully_shard.py to use common models #90386 [Composable API] Refactor test_fully_shard.py to use common models
• [Composable API] Move test models to common file #90385 [Composable API] Move test models to common file
• [FSDP][Easy] ufmt files #90384 [FSDP][Easy] ufmt files
• [FSDP()] Fix fully_shard fwd hook registration #90201 [FSDP()] Fix fully_shard fwd hook registration

[pytorch-bot]

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[H-Huang]

lgtm

[awgu]

@pytorchbot merge -f "format only"

[pytorchmergebot]

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