DOCX tables with nested lists fail to convert to Markdown format

When DOCX files contain tables with nested lists (`

` or `
`) in table cells, the converted Markdown format is inconsistent. Simple tables convert correctly to Markdown tables, but tables containing lists are preserved as HTML format instead.

## Steps to Reproduce

1. Create a DOCX file containing two tables:
- Table 1: A simple table (only text and paragraphs)
- Table 2: A table with ordered lists (`

1. `) in table cells
   2. Convert the DOCX file using `MarkItDown`
   3. Check the conversion result

   ## Actual Behavior

   - **Table 1** (simple table): Correctly converts to Markdown table format
   ```markdown
   | Column 1 | Column 2 |
   | --- | --- |
   | Text | More text |
   ```

   - **Table 2** (with lists): Remains as HTML format, not converted to Markdown
   ```html
   

   ...
   
   ```

   ## Expected Behavior

   All tables should be converted to Markdown table format, even when cells contain lists. List items can be converted to numbered text format (e.g., `1. Item 1`) to maintain Markdown table compatibility.

   ## Root Cause

   The `@joplin/turndown-plugin-gfm` plugin cannot convert tables containing complex nested structures (such as lists) to valid Markdown tables, because Markdown table syntax does not support nested list structures within table cells.