Remove dead slice code and add transformResponse test

[markerikson]

This PR:

• Deletes the leftover infiniteQuerySlice from the original draft PR
• Adds a test for transformResponse behavior

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@examples-query-react/basic	Configuration
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size-limit report 📦

Path	Size
1. entry point: @reduxjs/toolkit/query/react (modern.mjs)	14.37 KB (-0.1% 🔽)
1. entry point: @reduxjs/toolkit/query (cjs, production.min.cjs)	23.2 KB (-0.11% 🔽)
1. entry point: @reduxjs/toolkit/query/react (cjs, production.min.cjs)	25.62 KB (+0.16% 🔺)
2. entry point: @reduxjs/toolkit/query (without dependencies) (cjs, production.min.cjs)	10.02 KB (-0.26% 🔽)
3. createApi (.modern.mjs)	14.77 KB (-0.18% 🔽)
3. createApi (react) (.modern.mjs)	16.81 KB (-0.12% 🔽)

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