Excerpts shows the VideoPress URL for VideoPress v5

[SiobhyB]

Describe the bug

As first reported here by @fluiddot, after adding a VideoPress v5 block, the excerpt of the post in the Post list shows the URL. This differs from the VideoPress block, which we intentionally remove it (reference).

To Reproduce
Steps to reproduce the behavior:

1. In the app, select a WordPress.com site to edit and open the post editor.
2. Add the Video block and go through the steps to add a video.
3. Save your changes and return to the post list.
4. Observe the VideoPress URL in the post list.

Expected behavior

I'd expect the behaviour to match the VideoPress block, and for the URL to not be visible in the excerpt.

Screenshots