Issue #3172332 by shetpooja04, Pooja Ganjage, quietone: Remove unused variable...

Issue #3172332 by shetpooja04, Pooja Ganjage, quietone: Remove unused variable $process_plugin_manager in MigrationLookupTest.php, migrate module

core/modules/migrate/tests/src/Unit/process/MigrationLookupTest.php

@@ -111,7 +111,6 @@ public function skipInvalidDataProvider() {
   public function testNoSkipValid($value) {
     $migration_plugin = $this->prophesize(MigrationInterface::class);
     $migration_plugin_manager = $this->prophesize(MigrationPluginManagerInterface::class);
-    $process_plugin_manager = $this->prophesize(MigratePluginManager::class);
     $id_map = $this->prophesize(MigrateIdMapInterface::class);
     $id_map->lookupDestinationIds([$value])->willReturn([]);
     $migration_plugin->getIdMap()->willReturn($id_map->reveal());