Issue #3175666 by paulocs, shetpooja04, Lendude, anmolgoyal74, jijojoseph_zyxware, sanjayk, catch, kapilkumar0324: Remove unused $admin_user variable in FieldEntityOperationsTest.php, views module

(cherry picked from commit 5c9b9c19)

Issue #3175665 by shetpooja04, jijojoseph_zyxware: Remove unused $view variable in FilterTest.php, views module

Issue #3167599 by shetpooja04, jijojoseph_zyxware: Unused variable $frequency in locale module, locale.module

Issue #3167600 by shetpooja04, jijojoseph_zyxware: Unused variable $config in locale module, locale.bulk.inc

Issue #3165188 by shetpooja04, jijojoseph_zyxware, quietone: Unused variable $i in field module, FieldOptionTranslation.php

Issue #3164498 by shetpooja04, Sam152, jijojoseph_zyxware: Unused variable $entity_type_ids in content_moderation module, content_moderation.module