HPCC-9085 Fix Roxie JSON handling of array item names

New pull request to change target.  Based on:

https://github.com/hpcc-systems/HPCC-Platform/pull/4198

Simple arrays (ECL Sets) will no longer output names for items in
the array. Also nested children with same name as array ancestor
will not be treated as array items.

Signed-off-by: Anthony Fishbeck Anthony.Fishbeck@lexisnexis.com