Description:
    Generates files required for batched background migration.

Example:
    rails g batched_background_migration my_batched_migration --table_name=users --column_name=id --feature_category=gitaly

    This will create:
        db/post_migrate/20230213215230_queue_my_batched_migration.rb
        spec/migrations/20230213215230_queue_my_batched_migration_spec.rb
        lib/gitlab/background_migration/my_batched_migration.rb
        spec/lib/gitlab/background_migration/my_batched_migration_spec.rb
        db/docs/batched_background_migrations/my_batched_migration.yml