Add extensions to CombinedGraphQLErrors

[jerelmiller]

See #12704 (comment) for more context.

[changeset-bot]

🦋 Changeset detected

Latest commit: 8e86f7a

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

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[pkg-pr-new]

npm i https://pkg.pr.new/apollographql/apollo-client/@apollo/client@12711

commit: 8e86f7a

[github-actions]

size-limit report 📦

Path	Size
import { ApolloClient, InMemoryCache, HttpLink } from "@apollo/client" (CJS)	42.61 KB (+0.2% 🔺)
import { ApolloClient, InMemoryCache, HttpLink } from "@apollo/client" (production) (CJS)	37.76 KB (+0.25% 🔺)
import { ApolloClient, InMemoryCache, HttpLink } from "@apollo/client"	32.51 KB (-0.04% 🔽)
import { ApolloClient, InMemoryCache, HttpLink } from "@apollo/client" (production)	26.96 KB (+0.02% 🔺)
import { ApolloProvider } from "@apollo/client/react"	5.68 KB (0%)
import { ApolloProvider } from "@apollo/client/react" (production)	963 B (0%)
import { useQuery } from "@apollo/client/react"	7.51 KB (0%)
import { useQuery } from "@apollo/client/react" (production)	2.73 KB (0%)
import { useLazyQuery } from "@apollo/client/react"	6.94 KB (0%)
import { useLazyQuery } from "@apollo/client/react" (production)	2.2 KB (0%)
import { useMutation } from "@apollo/client/react"	6.52 KB (0%)
import { useMutation } from "@apollo/client/react" (production)	1.76 KB (0%)
import { useSubscription } from "@apollo/client/react"	6.62 KB (0%)
import { useSubscription } from "@apollo/client/react" (production)	1.86 KB (0%)
import { useSuspenseQuery } from "@apollo/client/react"	8.48 KB (0%)
import { useSuspenseQuery } from "@apollo/client/react" (production)	3.75 KB (0%)
import { useBackgroundQuery } from "@apollo/client/react"	8.22 KB (0%)
import { useBackgroundQuery } from "@apollo/client/react" (production)	3.51 KB (0%)
import { useLoadableQuery } from "@apollo/client/react"	8.52 KB (0%)
import { useLoadableQuery } from "@apollo/client/react" (production)	3.82 KB (0%)
import { useReadQuery } from "@apollo/client/react"	6.43 KB (0%)
import { useReadQuery } from "@apollo/client/react" (production)	1.68 KB (0%)
import { useFragment } from "@apollo/client/react"	6.47 KB (0%)
import { useFragment } from "@apollo/client/react" (production)	1.74 KB (0%)