Issue #3394450 by larowlan: Improve the failure message from...

Issue #3394450 by larowlan: Improve the failure message from Drupal\KernelTests\Core\DependencyInjection\AutowireTest

(cherry picked from commit 2402f97b)

core/tests/Drupal/KernelTests/Core/DependencyInjection/AutowireTest.php

@@ -101,7 +101,9 @@ public function testCoreServiceAliases(): void {
       }
     }
 
-    $this->assertSame($expected, array_intersect($expected, $aliases));
+    $missing = array_diff($expected, $aliases);
+    $formatted = Yaml::encode(array_map(fn ($alias) => sprintf('@%s', $alias), $missing));
+    $this->assertSame($expected, array_intersect($expected, $aliases), sprintf('The following core services do not have map the class name to an alias. Add the following to core.services.yml in the appropriate place: %s%s%s', \PHP_EOL, \PHP_EOL, $formatted));
   }
 
 }