test: Mock id method of account in \Drupal\Tests\menu_link_content\Unit\MenuLinkContentEntityAccessTest::testUnrecognizedOperation

Tobias Bährrequested to merge
issue/drupal-3555522:3555522-fix-test into 11.x

This MR tries to fix:

Menu Link Content Entity Access (Drupal\Tests\menu_link_content\Unit\MenuLinkContentEntityAccess)

⚠ Unrecognized operation
    
    1 test triggered 2 PHP deprecations:
    
    1) /builds/issue/drupal-2985400/core/lib/Drupal/Core/Entity/EntityAccessControlHandler.php:195
    Using null as an array offset is deprecated, use an empty string instead
    
    Triggered by:
    
    * Drupal\Tests\menu_link_content\Unit\MenuLinkContentEntityAccessTest::testUnrecognizedOperation
      /builds/issue/drupal-2985400/core/modules/menu_link_content/tests/src/Unit/MenuLinkContentEntityAccessTest.php:31
    
    2) /builds/issue/drupal-2985400/core/lib/Drupal/Core/Entity/EntityAccessControlHandler.php:221
    Using null as an array offset is deprecated, use an empty string instead
    
    Triggered by:
    
    * Drupal\Tests\menu_link_content\Unit\MenuLinkContentEntityAccessTest::testUnrecognizedOperation
      /builds/issue/drupal-2985400/core/modules/menu_link_content/tests/src/Unit/MenuLinkContentEntityAccessTest.php:31

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