pressing stop button on GraphiQL does not cancel in-flight requests

[n1ru4l]

When clicking the square button after executing a long-running query operation, the request is not canceled.

Reproduction:

1. start app

pnpm run --filter example-request-cancelation start

2. Open GraphiQL: http://localhost:4001/?query=%7B%0A++user+%7B%0A++++id%0A++++name%0A++++bestFriend+%7B%0A++++++id%0A++++++name%0A++++%7D%0A++%7D%0A%7D
3. Press the play button
4. immediately press the stop button
5. after 5 seconds the query result is still appearing, on the dev tools we can see that the request did not get canceled

Expected behaviour:
The in-flight request is canceled

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It seems like this is a missing feature within @graphql-tools/executor-http.