Fix markdown cell do not re-render when re-executed

[danilhendrasr]

This PR fixes #151151

With this PR I added a new command (notebook.cell.finishEdit) that increments the cell's text model version ID when triggered, I changed the re-rendering logic from content-based to version ID-based as well. This is done to distinguish between the action of re-executing cell and stop editing cell.

Meanwhile the already-existing command (notebook.cell.quitEdit) now only exits the cell edit mode when triggered, it does not trigger a re-render.

Tbh I don't fully understand some parts of the changes, so let me know if I can do some things better.

How to test

1. Create a Markdown cell with an tag referring to a non-existing path, e.g. <img src="myimg.png">.
2. Execute the cell. A "broken image" icon appears.
3. Create the image at the specified path.
4. Click the cell to edit. Re-execute it (without making any changes).

[ghost]

All CLA requirements met.

[msathyaanand]

Here are the steps to follow:

1. Create a Markdown cell with an <img> tag referring to a non-existing path. For example:
   

2. Execute the cell. A "broken image" icon will appear, indicating that the image couldn't be loaded because the specified path doesn't exist.

3. Create the image at the specified path (myimg.png in this case). Make sure to place the image in the correct location so that it can be accessed by the Jupyter Notebook or the Markdown renderer.

4. Click the cell to edit it. You can do this by double-clicking on the cell or selecting it and pressing Enter.

5. Re-execute the cell without making any changes. You can do this by clicking the "Run" button in the toolbar or by using the appropriate keyboard shortcut (e.g., Shift+Enter).

After re-executing the cell, the image should appear correctly since you have created it at the specified path. The broken image icon should no longer be displayed, indicating that the image is now being successfully loaded.

Hope this helps!