MSSQL

[ZBXNEXT-6235] fix rows to JSON to handle unique columns

Merge in AP/mssql from feature/ZBXNEXT-6235-6.5-1 to feature/ZBXNEXT-6235-6.5

* commit '717ca691071722ed43e513409a73432fa3aa71f8':
  [ZBXNEXT-6235] fix rows to JSON to handle unique columns