Update Jetstream catalog to support MaxText and Pytorch

[rlakhtakia]

• Create new subdirectories for MaxText & Pytorch

[linux-foundation-easycla]

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• ✅ login: rlakhtakia / name: Radhika Lakhtakia (27f2718, a907ca4, bf7e7f5)

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[jjk-g]

Thanks for improving this!

Let's remove the llama and gemma examples under the jetstream/ directory and just switch to their respective maxtext and pytorch subdirectories. Also remove the pytorch llama3-8b for now.

Then also comment validating the yamls deploy and the model servers start correctly.