fix(query): do not free the column reader in the no content encoders (#18116)
fix(query): do not free the column reader in the no content encoders (#18116)

The column reader passed to `flux.Table.Do` is automatically released.
The function passed to the column reader should never release it
manually. This causes a double release which causes the table to be
erroneously freed when it might be referenced by another transformation.

In particular, this affected the following:

    tables
    |> yield()
    |> to()

This is because this would produce a buffered table with two references
and pass it to both `yield()` and `to()` because `yield()` is a
pseudo-node that doesn't really exist. The real graph looks more like:

    tables |> yield()
    tables |> to()

The `yield()` would double release which would release the `to()`
transformation's copy of the column readers. The `to()` method would
then be invoked with an invalid column reader.
influxdb/influxdb,influxdb/influxdb,nooproblem/influxdb,nooproblem/influxdb,influxdata/influxdb,influxdb/influxdb,influxdb/influxdb,li-ang/influxdb,influxdb/influxdb,li-ang/influxdb,nooproblem/influxdb,influxdb/influxdb,nooproblem/influxdb,nooproblem/influxdb,influxdata/influxdb