fix(openapi-react-query): mutation results type

[sacha-c]

Changes

Adds proper types to the useMutation's onMutateResults fields which are used in onSettled, onError & return object of this hook.

The open issue regarding this bug: https://github.com/openapi-ts/openapi-typescript/issues/2518

I ended up digging further & this seems to fix it, but looking forward for a second pair of eyes to check that my fix is correct 🙂

Here I moved the Options type definition from the generic parameters to the actual options parameter themselves, thus not setting the UseMutationOptions's TOnMutateResult to the default unknown.

How to Review

Checklist

• [x] Unit tests updated
• [ ] docs/ updated (if necessary)
• [ ] pnpm run update:examples run (only applicable for openapi-typescript)

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[sacha-c]

Tests fail due to a refactor in Redocly's test folder structure (unrelated to this PR's change), I've opened a separate PR to address that here https://github.com/openapi-ts/openapi-typescript/pull/2522