Model parallel v2 llama finetuning notebook fixes

[ArjunKrishnak]

Description of changes:

• Updating the model parallel v2 README to clarify usage of shared-scripts directory
• Disabling fp8 by default for backward compatibility
• Updating llma finetuning example with inline comments for FSX args and upgrade command for pytest

Testing done: Ran smp-finetuning-llama-fsdp-tp.ipynb in sagemaker notebook and ensured sagemaker training job succeded

Merge Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your pull request.

• [x] I have read the CONTRIBUTING doc and adhered to the example notebook best practices
• [x] I have updated any necessary documentation, including READMEs
• [x] I have tested my notebook(s) and ensured it runs end-to-end
• [x] I have linted my notebook(s) and code using black-nb -l 100 {path}/{notebook-name}.ipynb

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