fix(types): initialData function that returns undefined should still discriminate after isSuccess check

[TkDodo]

closes #5870

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1 Ignored Deployment

Name	Status	Preview	Updated (UTC)
query	⬜️ Ignored (Inspect)		Aug 15, 2023 7:13am

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Sandbox	Source
@tanstack/query-example-react-basic-typescript	Configuration
@tanstack/query-example-solid-basic-typescript	Configuration
@tanstack/query-example-svelte-basic	Configuration
@tanstack/query-example-vue-basic	Configuration

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: +4.69% 🎉

Comparison is base (047005e) 88.72% compared to head (f02e8c2) 93.41%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             beta    #5869      +/-   ##
==========================================
+ Coverage   88.72%   93.41%   +4.69%     
==========================================
  Files          75       20      -55     
  Lines        2403      243    -2160     
  Branches      623       53     -570     
==========================================
- Hits         2132      227    -1905     
+ Misses        225       15     -210     
+ Partials       46        1      -45     

Files Changed	Coverage Δ
packages/react-query/src/queryOptions.ts	0.00% <ø> (ø)

... and 55 files with indirect coverage changes

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