Gutenberg entity usage improvements

[chindris]

Package(s) involved

silverback_gutenberg

Description of changes

Adds two entity usage plugins:

• one that tracks the linked content (coming from html link tags)
• one that tracks the referenced content from arbitrary gutenberg blocks, which have a uuid, and optionally an entityType, attribute. For example, if the project defines a custom/link-item block which has a gutenberg link control and stores the uuid and the entity type into the uuid and entityType attributes, them the plugin is able to track the usage of that content.

Related Issue(s)

#1382

How has this been tested?

• Kernel tests
• Unit tests

[Leksat]

Tested on silverback-template. Works great! But only for nodes.

For media we need to investigate more. This is what I saw in the database when tried to link a node and a media:

<!-- wp:paragraph -->
<p>a link to <a href="/node/6c0ac38d-ab7d-452d-b4d2-a98814fde715" data-type="Content: Basic page" data-id="6c0ac38d-ab7d-452d-b4d2-a98814fde715" data-entity-type="node">page</a></p>
<!-- /wp:paragraph -->

<!-- wp:paragraph -->
<p>a link to <a href="/media/5" data-type="Media: Document" data-id="0d00d8a2-65eb-4496-8e36-294e18b044ec">media</a></p>
<!-- /wp:paragraph -->

For media:

• href is not transformed to uuid - can cause issues with content export
• data-entity-type is missing - probably that's why it's not tracked

Could you take a look at the media? Maybe it's easy to fix. Or let's merge this one and create follow-ups for media.

[chindris]

Hi @Leksat !

I fixed the media issue with the last commit: 52b1a5c (when you test on silverback-template, make sure to just resave the Media matcher config, from the Linkit profile).

[Leksat]

@chindris I won't test it manually this time. The changes look good! Let's merge and enable it in the template?

[chindris]

Hi @Leksat !
PR merged, this can be tested now in the template.