Don't pass config changes through ConfigImporter::importInvokeOwner() for config entities

If we do, we should clean up the methods as well.
However, not sure how to combine this with #1886478: Bring back hook_config_import_CRUD() hooks

Hm. I've to admit that I did not understand the problem space that is described in the OP. Can we clarify that?

+++ b/core/lib/Drupal/Core/Config/Entity/ConfigStorageController.php
@@ -443,7 +443,6 @@ public function getQueryServicename() {
     $entity->save();
-    return TRUE;

@@ -474,7 +473,6 @@ public function importChange($name, Config $new_config, Config $old_config) {
     $entity->save();
-    return TRUE;

In any case, we probably want to return the result of ::save() here.

+++ b/core/includes/config.incundefined
@@ -271,9 +271,7 @@ function config_import_invoke_owner(array $config_changes, StorageInterface $sou
+        entity_get_controller($entity_type)->$method($name, $new_config, $old_config);

We can return whatever we want, we don't check it anywhere.

#3: config-1887304-3.patch queued for re-testing.

Pretty sure this is irrelevant now. #2218003: ConfigImporter assumes that a ConfigEntity uses a storage controller that implements ConfigStorageControllerInterface removed the return checking of import*