Copy-pasting table from MS Word to Quarto (Visual Editor) duplicates rows and columns

(Copied from https://github.com/rstudio/rstudio/issues/13806)

System details

RStudio Edition : Desktop
RStudio Version : 2023.12.0+170 
OS Version      : Windows 11
R Version       : 4.3.1
MS Office       : 365 (18.2306.1061.0)

Steps to reproduce the problem

1. Open a Microsoft Word-document with a simple table (e.g. 2x2 like below). Copy the table.

|-----|-----|
| A   | B   |
|-----|-----|
| C   | D   |
|-----|-----|

2. Create an empty Quarto document. Use Visual Editor.
3. Paste the table.

Describe the problem in detail

Observe that rows and columns are duplicated. This occurs both in release version and latest daily build.

+-----+-----+-----+-----+----+
|     |     |     |     |    |
+-----+-----+-----+-----+----+
|     | A   |     | B   |    |
+-----+-----+-----+-----+----+
|     |     |     |     |    |
+-----+-----+-----+-----+----+
|     | C   |     | D   |    |
+-----+-----+-----+-----+----+
|     |     |     |     |    |
+-----+-----+-----+-----+----+

Contrast this with a HTML-based table from a website which works as intended.

Describe the behavior you expected

A pasted table should contain as many rows and columns as in the original.

• I have read the guide for submitting good bug reports.
• I have installed the latest version of RStudio, and confirmed that the issue still persists.
• [-] If I am reporting an RStudio crash, I have included a diagnostics report.
• I have done my best to include a minimal, self-contained set of instructions for consistently reproducing the issue.

Reproduce the problem in an empty Quarto document using the Visual Editor: paste a simple table copied from Microsoft Word, then compare it with the expected row and column count. Trace the Visual Editor's paste handling for Word table content and verify that the pasted table preserves the original dimensions without duplicated rows or columns.