A worker can now opt to exclude the given queues by setting the `exclude_specified_queues` option.

If we have jobs without a queue they should be returned by `not_for_queues` unless one of the queues we don't want is specifically `nil`.

When shutting down and releasing jobs, we should still respect the `ActiveRecord.configuration.reserve_sql_strategy` and clear locks using explicit job ids if the strategy is `:default_sql`. This can help avoid transaction isolation conflicts when shutting down several job runners.