[BUG] Information extracted from table/image using Azure Document Intelligence API is not reflected in GraphRAG input

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Description

When a PDF document with the following structure is read by Azure Document Intelligence, files for Paragraph 1 and Paragraph 2 are created in the GraphRAG input folder, but no file is created for the Table/Image(description).

Paragraph 1
Table
Paragraph 2
Image
...

Reproduction steps

1. In Retrieval settings > GraphRAG Collection > File loader, select `Azure AI Document Intelligence (figure+table extraction)`
1. Upload a PDF file containing a table in GraphRAG
1. Execute a query related to the table

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OS

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Additional information

AzureAIDocumentIntelligenceLoader stores Text/Table/Image separately in the Document without duplication, while GraphRAGIndexingPipeline outputs only Text.

I think it would be more appropriate to have a format like ktem_app_data/markdown_cache_dir, where tables and other elements are expanded inline, as the text to be indexed.