Remove subscribeAndCount testing utility

[jerelmiller]

Closes #12173

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Latest commit: d1fef31

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@apollo/client	Major

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    "apollographql/[email protected]": {
      "remote": {
        "owner": "apollographql",
        "repo": "apollo-client",
        "branch": "jerel/deprecate-subscribe-and-count"
      }
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Name	Link
Commit	1c1bafb
Preview	https://www.apollographql.com/docs/deploy-preview/4437eab3b2ff534df1bc
Build ID	4437eab3b2ff534df1bc
File Changes	0 new, 1 changed, 0 removed * (developer-tools)/react/(latest)/integrations/react-native.md
Pages	1

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commit: d1fef31

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size-limit report 📦

Path	Size
dist/apollo-client.min.cjs	40.64 KB (0%)
import { ApolloClient, InMemoryCache, HttpLink } from "dist/main.cjs"	50.02 KB (0%)
import { ApolloClient, InMemoryCache, HttpLink } from "dist/main.cjs" (production)	47.14 KB (0%)
import { ApolloClient, InMemoryCache, HttpLink } from "dist/index.js"	36.14 KB (0%)
import { ApolloClient, InMemoryCache, HttpLink } from "dist/index.js" (production)	33.54 KB (0%)
import { ApolloProvider } from "dist/react/index.js"	1.26 KB (0%)
import { ApolloProvider } from "dist/react/index.js" (production)	1.24 KB (0%)
import { useQuery } from "dist/react/index.js"	5.21 KB (0%)
import { useQuery } from "dist/react/index.js" (production)	4.29 KB (0%)
import { useLazyQuery } from "dist/react/index.js"	5.7 KB (0%)
import { useLazyQuery } from "dist/react/index.js" (production)	4.78 KB (0%)
import { useMutation } from "dist/react/index.js"	3.62 KB (0%)
import { useMutation } from "dist/react/index.js" (production)	2.84 KB (0%)
import { useSubscription } from "dist/react/index.js"	4.43 KB (0%)
import { useSubscription } from "dist/react/index.js" (production)	3.48 KB (0%)
import { useSuspenseQuery } from "dist/react/index.js"	5.51 KB (0%)
import { useSuspenseQuery } from "dist/react/index.js" (production)	4.17 KB (0%)
import { useBackgroundQuery } from "dist/react/index.js"	5.01 KB (0%)
import { useBackgroundQuery } from "dist/react/index.js" (production)	3.66 KB (0%)
import { useLoadableQuery } from "dist/react/index.js"	5.09 KB (0%)
import { useLoadableQuery } from "dist/react/index.js" (production)	3.74 KB (0%)
import { useReadQuery } from "dist/react/index.js"	3.41 KB (0%)
import { useReadQuery } from "dist/react/index.js" (production)	3.35 KB (0%)
import { useFragment } from "dist/react/index.js"	2.36 KB (0%)
import { useFragment } from "dist/react/index.js" (production)	2.31 KB (0%)

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