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[PyTorch] Implement Selective Activation Checkpointing for LayerNormMLP with checkpoint flag (#2311)

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* make selectiuve activation checkpointing optional in slnmlp via checkpoint flag
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* refactor tests to call modified LayerNormMLP
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* refactor to implement selective activation checkpointing directly into LayerNormMLP, also fix bug to reach cleanup logic in fwd
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* fix MOST cuda graph failures by initializing identical quantizers during fwd. Float8CurrentScaling with bf16 and fp16 still fail with checkpointing
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