Llama3.3-70b: Merge relevant model changes from stable to main

Apply relevant model changes with shared sampling implementation and merge to main. Just once incremental PR for TTT Llama3.1-8b is ready this one can be merged. 

Relevant pipelines to test functionality:
    - metal demo
    - vllm nightly
    - Models CI for Llama3.3-70b + Qwen3 (expected failures for Llama3.1-8b)