Follow up tasks for update_record tool

[anushakolan]

1. We should use the SqlResponseHelper to create a response that MCP endpoint needs to avoid the duplicate serialization and deserialization. (I think this is addressed in your PR`
2. If the ClientRoleHeaderAuthenticationMiddleware isn't invoked, the roleheader here will be empty. This needs to be tested.
3. Add CLI dab configure --runtime.mcp.dml-tools.update_record.enabled true
4. Update dab validate (warn when update_record.enabled and not mcp.enabled)

[souvikghosh04]

1. We should use the SqlResponseHelper to create a response that MCP endpoint needs to avoid the duplicate serialization and deserialization. (I think this is addressed in your PR`
   [This is getting addressed by a separate task by @aaronburtle