Issue #2637432 by heykarthikwithu: Replace the entity manager with the entity...

Issue #2637432 by heykarthikwithu: Replace the entity manager with the entity type manager in MigrationGroup.php and remove unused imports

src/Entity/MigrationGroup.php

@@ -55,7 +55,7 @@ class MigrationGroup extends ConfigEntityBase implements MigrationGroupInterface
 
     // Order the migrations according to their dependencies.
     /** @var MigrationInterface[] $migrations */
-    $migrations = \Drupal::entityManager()->getStorage('migration')->loadMultiple($names);
+    $migrations = \Drupal::entityTypeManager()->getStorage('migration')->loadMultiple($names);
 
     // Delete in reverse order, so dependencies are never violated.
     $migrations = array_reverse($migrations);

src/Event/MigratePrepareRowEvent.php

@@ -7,8 +7,6 @@
 
 namespace Drupal\migrate_plus\Event;
 
-use Drupal\migrate\Entity\MigrationInterface;
-use Drupal\migrate\MigrateSkipRowException;
 use Drupal\migrate\Plugin\MigrateSourceInterface;
 use Drupal\migrate\Row;
 use Symfony\Component\EventDispatcher\Event;