VideoPress v5: Investigate cases where app markup differs to the web

[SiobhyB]

There are some cases where the markup produced in the app differs to the web.

For example, on the web, the videoPressClassNames and title attributes are added to the block's markup for the following site types:

Site Type	videoPressClassNames	title
Simple	✅	✅
Atomic w/VideoPress	✅	❌
Atomic w/no VideoPress	❌	❌
Jetpack w/VideoPress	❌	❌
Jetpack w/no VideoPress	❌	❌

The videoPressClassNames and title attributes are never added to the markup in the app.

In addition, there is an edge case, as described here, where manually adding a videos.files.wordpress.com/* URL automatically converts to a videopress.com/* URL in the app, but not on the web.

These changes are non-breaking, but would be nice to resolve in order for the markup to always be consistent across platforms.