Gateway not forwarding the operationName to downstream services

**Actual Behaviour**
The Gateway not passing the operationName to the downstream services

**Expected Behaviour**
The Gateway should include the operationName passed in the request body while calling the process method along with query/variables/http, so that the downstream services get the operationName.

Start by tracing the Gateway request handling to the process method described in the issue, focusing on how query, variables, and http are passed downstream. Confirm the operationName from the request body is included in that call and verify that downstream services receive it.

Written by the indexing model from the issue text.