fix: Set trust_remote_code=True when verifying config.json load

[venkywonka]

PR title

Set trust_remote_code=True when verifying config.json load.
When this isn't set, the behavior defaults to the model-config-specific from_hugging_face implementation's default trust_remote_code value.
For models like LlamaConfig, their internal usage default to trust_remote_code=True unless specified - but others like DeciLMConfig deafults to trust_remote_code=False. When its False, it raises an error when loading from huggingface.

Test Coverage

There is a unittest that hits that code-path (tests/unittest/llmapi/test_llm_utils.py#L15-L36), but it uses TinyLlama hence passes.

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[Copilot]

Pull Request Overview

This PR fixes model configuration loading by setting trust_remote_code=True in the call to AutoConfig.from_hugging_face, ensuring consistent behavior when loading config.json.

• Adjusted AutoConfig.from_hugging_face call in the HF branch
• Aims to prevent errors for models like DeciLMConfig when trust_remote_code is False

[Superjomn]

LGTM.

[venkywonka]

closing this, as this is model-specific, and included in #4128