No BWC tests for serialization of SqlQueryRequest/Response and potentially other wire formats #78600
Description
#78424 revealed a compatibility bug in deserialization of SqlQueryResponse that should have been caught earlier when merging #73991 .
In order to avoid similar surprises in the future, we need a BWC test that at least exercise a full serialization/deserialization cycle of SqlQueryResponse and SqlQueryRequest (maybe more wire types). Similar tests already exist for EQL
(#68339).