Add support for forwardIndexDisabled for derived columns

Support for disabling the forward index was added (details can be found in this issue: https://github.com/apache/pinot/issues/6473). The existing changes do not handle adding support for disabling the forward index for derived columns. This issue tracks changes needed for derived column handling.

cc @siddharthteotia

Start by reading issue #6473 and tracing the existing forward-index disabling support in Apache Pinot. Then locate the derived-column handling path and determine how it should honor forwardIndexDisabled; done means derived columns support the same disabling behavior, with relevant tests updated or added.

Written by the indexing model from the issue text.