Fix tests on 8.x-1.x branch

MR created.

The MR fixes the issue with the thumbnail generation, but there are still errors in TokenMenuUiContentModerationTest.

The error in the output for TokenMenuUiContentModerationTest is:

Drupal\Core\Entity\EntityStorageException: An existing default revision of the 'menu_link_content' entity type can not be changed to a non-default revision. in Drupal\Core\Entity\Sql\SqlContentEntityStorage->save() (line 815 of core/lib/Drupal/Core/Entity/Sql/SqlContentEntityStorage.php).

The error stems from this core change: 🐛 Disallow saving the current default revision as a non-default revision Active

There's an existing issue for that

Ah yes, thank you - 📌 Avoid incorrect and unecessary menu_link_content entity saving Active .

So is the thumbnail fix all that this issue needs to be responsible for?

Yeah.

Merged.

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