Issue #2562073 by phenaproxima, mikeryan: Filter format migrations need to handle php_code filter

core/modules/filter/migration_templates/d6_filter_format.yml

core/modules/filter/migration_templates/d7_filter_format.yml

...s/filter/src/Tests/Migrate/d6/MigrateFilterFormatTest.php

...s/filter/src/Tests/Migrate/d7/MigrateFilterFormatTest.php

...dules/migrate_drupal/src/Tests/Table/d6/FilterFormats.php

core/modules/migrate_drupal/src/Tests/Table/d6/Filters.php

core/modules/migrate_drupal/src/Tests/Table/d6/MenuLinks.php

.../modules/migrate_drupal/src/Tests/Table/d6/MenuRouter.php

core/modules/migrate_drupal/src/Tests/Table/d6/System.php

core/modules/migrate_drupal/src/Tests/Table/d7/Filter.php

...odules/migrate_drupal/src/Tests/Table/d7/FilterFormat.php

...ules/migrate_drupal/src/Tests/Table/d7/RolePermission.php

core/modules/migrate_drupal/src/Tests/Table/d7/System.php

core/modules/migrate_drupal/src/Tests/Table/d7/Variable.php

...modules/user/src/Tests/Migrate/d6/MigrateUserRoleTest.php