Problem/Motivation
jsonapi modules assumes all core entities implement either ContentEntityTypeInterface or ConfigEntityTypeInterface. This is correct at the time of writing this. but #2401463: Make dblog entities introduces an entity type that implements directly EntityTypeInterface and makes some jsonapi tests fail. Even if when this entity is marked as @internal and no support for jsonapi is offered.
There is another issue to actually give support to any type of entity types: #3042467: Support entities that are neither content nor config entities but this is a feature request and can take some time to be properly coded. In the meantime I think this qualifies as a bug which blocks other issues to be developed.
Steps to reproduce
Check any of the tests from #2401463: Make dblog entities before the temporal hack was introduced in https://git.drupalcode.org/project/drupal/-/merge_requests/1159/diffs?co...
Example: https://www.drupal.org/pift-ci-job/2180203
Proposed resolution
Until #3042467: Support entities that are neither content nor config entities is properly implemented, ignore entities that are not either ContentEntityTypeInterface or ConfigEntityTypeInterface when running jsonapi tests.