Issue #3435893 make unknown_packages translatable

Closes #3435893

package_manager/src/Validator/SupportedReleaseValidator.php

@@ -121,12 +121,16 @@ final class SupportedReleaseValidator implements EventSubscriberInterface {
       $event->addError($unsupported_packages, $summary);
     }
     if ($unknown_packages) {
-      $summary = $this->formatPlural(
-        count($unknown_packages),
-        'Cannot update because the following new or updated Drupal package does not have project information.',
-        'Cannot update because the following new or updated Drupal packages do not have project information.',
-      );
-      $event->addError($unknown_packages, $summary);
+      $event->addError([
+        $this->formatPlural(
+          count($unknown_packages),
+          'Cannot update because the following new or updated Drupal package does not have project information: @unknown_packages',
+          'Cannot update because the following new or updated Drupal packages do not have project information: @unknown_packages',
+          [
+            '@unknown_packages' => implode(', ', $unknown_packages),
+          ],
+        ),
+      ]);
     }
   }