🚨 EP: fix EP router contract for many models + honor FP8 scale format
Author: IlyasMoutawwakil
Pull request: yes
Labels: name: for patch

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Comments:
The docs for this PR live [here](https://moon-ci-docs.huggingface.co/docs/transformers/pr_46818). All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

Let's also update the PR description please so we summarize the changes a bit
1. FP8 scale changes 
2. EP Plans for all moes
    - Refactor along all models to follow the same format as router/gate -> experts (-> shared experts)
    - Additional miscallenous stuff like erroring out on moes that should have the plan 

**CI Dashboard:** [View test results in Grafana](https://transformers-ci.lor-e.huggingface.cool/d/pytest-observability-by-pr/pytest-observability-branch?var-pr=46818)

Need to check whether we need to update various conversion mappings; so withholding to merge for now

**[For maintainers]** Suggested jobs to run (before merge)

run-slow: afmoe, cohere2_moe, deepseek_ocr2, deepseek_v2, deepseek_v3, deepseek_v32, dots1, ernie4_5_moe, ernie4_5_vl_moe, exaone_moe, flex_olmo, glm4_moe, glm4_moe_lite, glm4v_moe, glm_moe_dsa, hunyuan_v1_moe