Fix empty community report due to community id mismatch

[LevickCG]

Description

[Provide a brief description of the changes made in this pull request.]
Current local search module fails to integrate community reports because of mismatched community_id, this pr changed the code of graphrag/query/structured_search/local_search/mixed_context.py, so that the community id in mixed_contaext actually matches.

Empty selected community due to previously unmatched community id:

Related Issues

This pull request aims to fix the problem mentioned in following issue.
issue1391

Proposed Changes

Change the mismatched community_id (from uuid and human-readable-id to human-readable-id to human-readable-id) so that the selected community would no be empty, and the structure information of community report will be used.

Here are the different outputs in comparison:

Previous:

After:

Checklist

• I have tested these changes locally.
• I have reviewed the code changes.
• I have updated the documentation (if necessary).
• I have added appropriate unit tests (if applicable).

Additional Notes

I have checked the code to make sure it won't affect other modules that might use the mix_context, but I'm not fully aware of every detail of all the code given the complexity of the entire project. Please reach out if you notice any interactions or if there are specific areas you'd like me to double-check.

[LevickCG]

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