chore(react-query): drop support for React17

[illuzan]

Closes: #4683

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[TkDodo]

Thank you. I think there are a couple of things missing:

• look for REACTJS_VERSION string
• most things in jest.setup.ts can go:

https://github.com/TanStack/query/blob/4ae99561ca3383d6de3f4aad656a49ba4a17b57a/packages/react-query/jest.setup.ts#L9-L39

• this as well: https://github.com/TanStack/query/blob/c376158afaddf7cd92a85491c3f18c1b123efe4b/packages/react-query/src/tests/ssr-hydration.test.tsx#L17
• we can always use ReactDOM.hydrate: https://github.com/TanStack/query/blob/c376158afaddf7cd92a85491c3f18c1b123efe4b/packages/react-query/src/tests/ssr-hydration.test.tsx#L19-L35
• this is also a leftover that can go: https://github.com/TanStack/query/blob/11f08c37d56c8aa5d9b28d8422842bc1a147c487/package.json#L38

[TkDodo]

@illuzan will you continue to work on this PR or should someone else take over?

[illuzan]

Yes, I will work on this I was just busy with work stuff.

[illuzan]

@TkDodo I have pushed an update, can you take a look?

[TkDodo]

there are conflicts with v5, can you please fix them?

[TkDodo]

why was this PR closed @illuzan ?

[illuzan]

Looks like I messed up pushing it again.