docs: update query notebooks to current model factories

[qianzhu / Lucien (qianzhu18)]

Summary

• update the query notebooks to use the current graphrag_llm model factories
• replace stale ModelType, LanguageModelConfig, and ModelManager imports with ModelConfig, RetryConfig, create_completion, and create_embedding
• keep the existing notebook search flows intact while aligning them with the package layout on main

Why

Issue #2301 reports that the example notebooks no longer match the current code structure. On main, graphrag.config.enums no longer exports ModelType, and the notebooks still point at the older model manager entry points.

This update refreshes the affected query notebooks so their model setup matches the current API surface shipped in the repository today.

Scope

• docs/examples_notebooks/local_search.ipynb
• docs/examples_notebooks/global_search.ipynb
• docs/examples_notebooks/global_search_with_dynamic_community_selection.ipynb
• docs/examples_notebooks/drift_search.ipynb

Closes #2301

[qianzhu / Lucien (qianzhu18)]

@microsoft-github-policy-service agree

[qianzhu / Lucien (qianzhu18)]

Hi, just a friendly follow-up on this PR. It updates the official query notebooks from deprecated model setup paths (ModelType / LanguageModelConfig) to the current graphrag_llm model factory APIs, so new users following the examples won't hit import errors on the latest main branch. Happy to adjust if anything needs changing.