[Bug] Queuing resolvers doesn't work with refetchable fragments

Hey folks,

In our project ([MS Nova repo](https://github.com/microsoft/nova-facade/tree/main/packages/nova-react-test-utils)) we rely heavily on `mock.queueOperationResolver` to prepare the environment for stories/unit tests. Recently, we found that the function doesn't behave as it should for resolving operations, meaning the resolver from queue is not executed at all. Here is a draft PR link which adds a test that fails (#5001), pasting it here for convenience as well:

```
it('refetches new variables correctly when refetching same id and queued resolver', () => {
const renderer = renderFragment();
const initialUser = {
id: '1',
name: 'Alice',
profile_picture: null,
...createFragmentRef('1', query),
};
expectFragmentResults([{data: initialUser}]);

// Mock network response upfront
environment.mock.queueOperationResolver(operation =>
MockPayloadGenerator.generate(operation, {
Node: () => ({
__typename: 'User',
id: '1',
name: 'Alice',
profile_picture: {
uri: 'scale32',
},
username: 'useralice',
}),
}),
);

TestRenderer.act(() => {
refetch({scale: 32});
});

// Assert that fragment is refetching with the right variables and
// suspends upon refetch
const refetchVariables = {
id: '1',
scale: 32,
};
refetchQuery = createOperationDescriptor(
gqlRefetchQuery,
refetchVariables,
{force: true},
);
expectFragmentIsRefetching(renderer, {
refetchVariables,
refetchQuery,
});

// Assert fragment is rendered with new data
const refetchedUser = {
id: '1',
name: 'Alice',
profile_picture: {
uri: 'scale32',
},
...createFragmentRef('1', refetchQuery),
};
expectFragmentResults([{data: refetchedUser}]);
expect(isOperationRetained(refetchQuery)).toBe(true);
});
```

On the branch I added some debug logs and it seems that operation doesn't show up in `pendingOperations` and the resolver is not used at all.

The same test works when one uses `mock.resolve` or `mock.resolveMostRecentOperartion` but would be great if queuing resolvers also worked for refetchable operations.