do not overwrite own AbortSignal if an external AbortSignal is passed in

[phryneas]

This still needs tests so I'll keep it as draft for now.
I just wanted to put this in so I don't forget about it.

[changeset-bot]

🦋 Changeset detected

Latest commit: 2537c96

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@apollo/client	Patch

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[pkg-pr-new]

npm i https://pkg.pr.new/@apollo/client@12650

commit: 2537c96

[github-actions]

size-limit report 📦

Path	Size
import { ApolloClient, InMemoryCache, HttpLink } from "@apollo/client" (CJS)	42.18 KB (+0.48% 🔺)
import { ApolloClient, InMemoryCache, HttpLink } from "@apollo/client" (production) (CJS)	37.34 KB (+0.04% 🔺)
import { ApolloClient, InMemoryCache, HttpLink } from "@apollo/client"	32.34 KB (+0.17% 🔺)
import { ApolloClient, InMemoryCache, HttpLink } from "@apollo/client" (production)	26.92 KB (+0.27% 🔺)
import { ApolloProvider } from "@apollo/client/react"	5.56 KB (0%)
import { ApolloProvider } from "@apollo/client/react" (production)	963 B (0%)
import { useQuery } from "@apollo/client/react"	11.45 KB (0%)
import { useQuery } from "@apollo/client/react" (production)	6.83 KB (0%)
import { useLazyQuery } from "@apollo/client/react"	6.74 KB (0%)
import { useLazyQuery } from "@apollo/client/react" (production)	2.12 KB (0%)
import { useMutation } from "@apollo/client/react"	6.11 KB (0%)
import { useMutation } from "@apollo/client/react" (production)	1.48 KB (0%)
import { useSubscription } from "@apollo/client/react"	6.46 KB (0%)
import { useSubscription } from "@apollo/client/react" (production)	1.83 KB (0%)
import { useSuspenseQuery } from "@apollo/client/react"	8.17 KB (0%)
import { useSuspenseQuery } from "@apollo/client/react" (production)	3.57 KB (0%)
import { useBackgroundQuery } from "@apollo/client/react"	7.99 KB (0%)
import { useBackgroundQuery } from "@apollo/client/react" (production)	3.4 KB (0%)
import { useLoadableQuery } from "@apollo/client/react"	7.97 KB (0%)
import { useLoadableQuery } from "@apollo/client/react" (production)	3.38 KB (0%)
import { useReadQuery } from "@apollo/client/react"	6.22 KB (0%)
import { useReadQuery } from "@apollo/client/react" (production)	1.61 KB (0%)
import { useFragment } from "@apollo/client/react"	6.29 KB (0%)
import { useFragment } from "@apollo/client/react" (production)	1.68 KB (0%)