Fix issue grouping on GraphQL requests

[jamescrosswell]

Description

We should apply the same fix to GraphQL that was applied in:

• Improve SentryHttpFailedRequestHandler issue grouping #4724

[linear]

NET-540

[ericsampson]

Done in #4762 :)

[Flash0ver]

Thank you so much, @ericsampson!

[Flash0ver]

@ericsampson, please reach out to me via Email (stefan.poelz@sentry.io) or any other channel listed in my profile (@Flash0ver) ... we want to say "thank you" for your high-quality contributions with Sentry swag