Clone response too to avoid inconsistencies in muti query responses

Signed-off-by: Alexandre Bodin <bodin.alex@gmail.com>

packages/strapi-plugin-graphql/services/Mutation.js

@@ -185,6 +185,7 @@ module.exports = {
         request: Object.assign(_.clone(context.request), {
           graphql: null,
         }),
+        response: _.clone(context.response),
       });
 
       // Execute policies stack.

packages/strapi-plugin-graphql/services/Query.js

@@ -246,6 +246,7 @@ module.exports = {
         request: Object.assign(_.clone(context.request), {
           graphql: null,
         }),
+        response: _.clone(context.response),
       });
 
       // Note: we've to used the Object.defineProperties to reset the prototype. It seems that the cloning the context