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* Fix test of FSDP2 by correcting init logic and applying autocast

This fixes multiple issues in the FSDP2 test, namely
1. Previously fp8 init was performed when `args.fp8_init == False`. I have updated the logic to match what I presume was intended by leveraging the nullcontext context manager.
2. `te.fp8_autocast` was previously not called; the recipe was created but was unused. The autocast context manager now wraps the model's computation.
Signed-off-by: Neil Tenenholtz <ntenenz@users.noreply.github.com>

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* Fix typo
Signed-off-by: Neil Tenenholtz <ntenenz@users.noreply.github.com>

* Update tests/pytorch/distributed/run_fsdp2_model.py
Signed-off-by: Tim Moon <4406448+timmoon10@users.noreply.github.com>

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* Fix bug when constructing context for model init
Signed-off-by: Tim Moon <4406448+timmoon10@users.noreply.github.com>

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Signed-off-by: Neil Tenenholtz <ntenenz@users.noreply.github.com>
Signed-off-by: Tim Moon <4406448+timmoon10@users.noreply.github.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Tim Moon <4406448+timmoon10@users.noreply.github.com>