Add SMP v2 notebooks using latest PyTorch 2.3.1, TSM 2.5.0 release following new directory structure (#4739)

Rename notebooks and all badge paths to follow new directory structure.
Add context parallel example notebook
Update model parallel v2 shared_scripts
Update pysdk>=2.240
Add FP8 Mixtral notebook
Update configs and cleanup

Author: viclzhu

build_and_train_models/sm-distributed_model_parallel_v2/README.md

@@ -0,0 +1,15 @@
+## Sagemaker Model Parallelism
+
+This directory contains example scripts to train or fine-tune large scale models,
+with the Sagemaker distributed model parallelism library.
+When using one of the ipynb notebooks within the folders of this directory please 
+make sure to use the `./shared-scripts/` directory as the source directory when submitting a job.
+
+For example, if one wanted to submit a llama finetune job on Sagemaker using the `/llama_v2/smp-finetuning-llama-fsdp-tp.ipynb`
+notebook, they would have to copy that notebook within the `./shared-scripts/` directory to make sure it can access all the accompanied files.
+
+After cloning this repository run the following command to setup a copy of the notebook associated with your desired model into the `./shared-scripts/` directory.
+
+- `cp [RELATIVE PATH TO ipynb] shared-scripts/`
+
+Finally, upload the `./shared-scripts/` directory to a Sagemaker notebook to submit your training/finetuning job.