feat(query-core, react-query): backport v5 types, deprecate `isLoading` in favor of `isPending` in mutation observer results

[manudeli]

Deprecation and Property to enhance migration to v5 gradually:

• Marked isLoading property as deprecated in multiple MutationObserver result interfaces (MutationObserverBaseResult, MutationObserverIdleResult, MutationObserverLoadingResult, MutationObserverErrorResult, MutationObserverSuccessResult) and added the isPending property as its replacement.

Type backport like v5:

• Exported UseSuspenseQueryOptions, UseSuspenseQueryResult, SuspenseQueriesResults, SuspenseQueriesOptions, DefinedInitialDataOptions, and UndefinedInitialDataOptions, DefinedInitialDataOptions and UndefinedInitialDataOptions types like v5

Many people are still on v4, and the same is true for my company. If we backport some of the v5 APIs to v4 well, it would ease their migration and reduce friction. This can help accelerate the adoption of v5 eventually, allowing us to concentrate our efforts on v5 improvements.

What I want to backport after this Pull Request

1. useSuspenseInfiniteQuery
2. infiniteQueryOptions

[nx-cloud[bot]]

View your CI Pipeline Execution ↗ for commit 569efbb26759be1008610990d689551dd21e7eea.

Command	Status	Duration	Result
nx affected --targets=test:lib,test:types,test:...	✅ Succeeded	1m 19s	View ↗
nx affected --targets=test:lib --base=79f0b9ad2...	✅ Succeeded	<1s	View ↗

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☁️ Nx Cloud last updated this comment at 2025-06-11 16:21:32 UTC

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 91.62%. Comparing base (84e8ae5) to head (569efbb). Report is 29 commits behind head on v4.

Additional details and impacted files

@@            Coverage Diff             @@
##               v4    #9266      +/-   ##
==========================================
- Coverage   95.16%   91.62%   -3.54%     
==========================================
  Files          13      117     +104     
  Lines         496     4478    +3982     
  Branches      179     1184    +1005     
==========================================
+ Hits          472     4103    +3631     
- Misses         23      344     +321     
- Partials        1       31      +30     

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[manudeli]

This resolve this eslint warning