Convert the Workspace entity to use EntityOwnerTrait

It's funny that #2949964: Add an EntityOwnerTrait to standardize the base field needed by EntityOwnerInterface was opened from a review of the initial workspace patch, but handling the workspace entity has been left to a followup :)

Anyway, once the parent issue lands, this patch should do it.

Fix component following module rename.

Looks good to me.

As an experimental module backporting to 8.6.x

Committed and pushed 69a3c90ce9 to 8.7.x and 1564d99234 to 8.6.x. Thanks!

diff --git a/core/modules/workspaces/src/Entity/Workspace.php b/core/modules/workspaces/src/Entity/Workspace.php
index 33649be4f5..5796b207bf 100644
--- a/core/modules/workspaces/src/Entity/Workspace.php
+++ b/core/modules/workspaces/src/Entity/Workspace.php
@@ -9,7 +9,6 @@
 use Drupal\Core\Field\BaseFieldDefinition;
 use Drupal\Core\StringTranslation\TranslatableMarkup;
 use Drupal\user\EntityOwnerTrait;
-use Drupal\user\UserInterface;
 use Drupal\workspaces\WorkspaceInterface;
 
 /**

Fixed unused use on commit.

This introduced test failures on 8.6.x because #2949964: Add an EntityOwnerTrait to standardize the base field needed by EntityOwnerInterface wasn't backported:
https://www.drupal.org/pift-ci-job/1071807
https://www.drupal.org/pift-ci-job/1071809

Testing Drupal\Tests\config\Functional\ConfigImportAllTest
E                                                                   1 / 1 (100%)

Time: 1.17 minutes, Memory: 4.00MB

There was 1 error:

1) Drupal\Tests\config\Functional\ConfigImportAllTest::testInstallUninstall
PHPUnit\Framework\Exception: Fatal error: Trait 'Drupal\user\EntityOwnerTrait' not found in /var/www/html/core/modules/workspaces/src/Entity/Workspace.php on line 68

Yeah, this needs rolling back from 8.6.x as EntityOwnerTrait is a new feature in 8.7.x only.

Fixed