Remove entity loading from \Drupal\entity_usage\Plugin\EntityUsage\Track\LayoutBuilder and use entity queries instead

Note that I've tested the code and there looks to be test coverage too but the massive site I'm working on does not use this plugin so I've not done a full performance test.

I think with \Drupal\Tests\entity_usage\FunctionalJavascript\EntityUsageLayoutBuilderEntityBrowserBlockTest and \Drupal\Tests\entity_usage\Functional\EntityUsageLayoutBuilderTest we have test coverage of my changes.

Agreed, thank you! 👍

Automatically closed - issue fixed for 2 weeks with no activity.