Block validation is broken for any block without a default value for `label_display`
In https://git.drupalcode.org/project/canvas/-/work_items/3580070 the block validation was made more strict, but the specific change at https://git.drupalcode.org/project/canvas/-/merge_requests/781/diffs#59ded1a3629db160a30606a1539355444550d005_97_105 is invalid, label_display cannot be `FALSE`, it should be `'0'`. This is already set correctly lower down at https://git.drupalcode.org/project/canvas/-/blob/1.x/src/Plugin/Canvas/ComponentSource/BlockComponentDiscovery.php?ref_type=heads#L169
This is breaking all of the Drupal CMS CI: [example](https://git.drupalcode.org/project/drupal_cms/-/jobs/10103058)
issue