flag for export model to enable export InternVL2

[przepeck]

🛠 Summary

CVS-180948
Adding new parameter to export_model to enable export of model with requirement for trusting remote code.

🧪 Checklist

• Unit tests added.
• The documentation updated.
• Change follows security best practices.
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[Copilot]

Pull request overview

Adds a --trust_remote_code flag to the model export flow to support exporting InternVL2 (and other models requiring trusted remote code) by passing the corresponding option through to tokenizer conversion.

Changes:

• Added --trust_remote_code CLI flag to export_model.py and plumbed it into the convert_tokenizer invocation.
• Updated demo/docs command examples and usage output to include the new flag.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 5 comments.

File	Description
demos/continuous_batching/vlm/README.md	Updates InternVL2 export commands to include --trust_remote_code.
demos/common/export_models/export_model.py	Adds CLI flag and conditionally appends --trust-remote-code to convert_tokenizer.
demos/common/export_models/README.md	Documents the new CLI flag in usage/help output.

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