Entity embed JS plugin interprets images as drupalentity widgets

Problem/Motivation

Currently, our JS plugin identifies drupalentity widgets with divs containing data-entity-type and one of data-entity-id and data-entity-uuid attributes. This approach worked fine unless Core started using the same attributes for image usage tracking in #2350327: editor.module should use the same data- attributes as entity_embed.module uses. And as a result, now the image plugin treats inserted images too as drupalentity. To fix this, we need to use the same approach used by the entity embed filter i.e. apart from these two attributes, one of data-view-mode or data-entity-display must also be present.

Proposed resolution

JS plugin must ensure that one of data-view-mode or data-entity-display attributes must also be present for an element to be a drupalentity widget.

Remaining tasks

- Patch
- Review

User interface changes

- Images are now NOT interpreted as drupalentity widgets

API changes

None