express-graphql >=0.10.0 instrumentation with node <10.4 doesn't work

[trentm]

The work in #2511 to add support for more recent versions of express-graphql hit an issue: There is some issue with express-graphql >=0.10.0 and node <10.4 (released 2018-06-06) such that the wrapped graphql.execute called by express-graphql is not in the run context of the transaction, so the graphql span does not get created and the transaction does not get marked as a GraphQL transaction.

It works with [email protected], FWIW. I'm not sure what is going on; but I'm also not sure it is worth supporting given node v10 is EOL at this point.