[megatron] support multimodal MTP

[Jintao-Huang]

No description provided.

[gemini-code-assist]

Summary of Changes

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This pull request significantly enhances the Megatron-SWIFT framework by introducing full support for multimodal MTP training. Previously, users were restricted from training multimodal models with MTP, often requiring a bypass for a validation check. This change eliminates that barrier, allowing for more flexible and powerful training configurations for multimodal large language models. The core model logic has been adjusted, and all relevant documentation and example scripts have been updated to reflect this new capability, streamlining the user experience.

Highlights

• Multimodal MTP Support: Enabled support for multimodal MTP (Megatron-Tensor Parallelism) training, removing a previous limitation.
• Validation Check Removal: The ValueError check that prevented multimodal MTP training in mm_gpt_model.py has been removed.
• Documentation Update: Updated both Chinese and English documentation to reflect the new support for multimodal MTP, removing the previous disclaimer.
• Example Script Refinement: Modified example training scripts (mcore_full.sh, packing.sh) by removing the now-obsolete SKIP_MULTIMODAL_MTP_VALIDATION=1 environment variable.

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[gemini-code-assist]

Code Review

This pull request successfully implements support for multimodal MTP by removing the previous validation check that prevented its use with multimodal models. The corresponding documentation and example scripts have been updated to reflect this change, removing the SKIP_MULTIMODAL_MTP_VALIDATION environment variable. The changes are consistent and directly address the stated objective of supporting multimodal MTP.