Add graphql integration option to automatically rename root spans based on `graphql.operation.name`

[andreiborza]

Description

Root spans are currently named by otel and are cumbersome to retroactively change to a more meaningful name. See #12887 (comment).

Brainstorm
Add an option akin to inferRootSpanNameFromGraphQLOperation: boolean (naming TBD) to our GraphQL instrumentation to update the name of the root span to that of the (last) child span that has a graphql.operation.name set.