ISTWCMS-7275: Rename ReferencesBlock to ReferenceBlock for consistency.

The block class name and annotation were updated to align with a singular naming convention. This change ensures clarity and uniformity across the codebase.

src/Plugin/Block/ReferencesBlock.php → src/Plugin/Block/ReferenceBlock.php

@@ -11,14 +11,14 @@ use Drupal\Core\Session\AccountProxyInterface;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
 /**
- * Provides a 'References' block.
+ * Provides a 'Reference' block.
  *
  * @Block(
  *  id = "uw_publication_reference_block",
  *  admin_label = @Translation("References"),
  * )
  */
-class ReferencesBlock extends BlockBase implements ContainerFactoryPluginInterface {
+class ReferenceBlock extends BlockBase implements ContainerFactoryPluginInterface {
 
   /**
    * Entity type manager from the core.