Issue #2061879 by Palashvijay4O, chx: Remove Schema::copyTable

core/includes/database.inc

...b/Drupal/Core/Database/Driver/fake/FakeDatabaseSchema.php

core/lib/Drupal/Core/Database/Driver/mysql/Schema.php

core/lib/Drupal/Core/Database/Driver/pgsql/Schema.php

core/lib/Drupal/Core/Database/Driver/sqlite/Schema.php

core/lib/Drupal/Core/Database/Schema.php

core/modules/system/src/Tests/Database/SchemaTest.php