Drop support for Node 18 and installGlobals

[brophdawg11]

Per https://nodejs.org/en/about/previous-releases:

• Node 20 has been the Active LTS version for a year now
• Node 22 will become Active LTS this month
• Node 18 will be losing it's "Maintenance LTS" status in April 2025
• With React Router v7 landing (hopefully) in late 2024, it makes sense to go ahead and drop support for Node 18 and focus on Node 20/22

This means we no longer need an installGlobals method because fetch is stable in Node 20 🎉

TODO:

• Add docs section showing how to install your own polyfills if needed (basically write your own installGlobals in userland)

[changeset-bot]

🦋 Changeset detected

Latest commit: f1fcf52

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 10 packages

Name	Type
@react-router/express	Major
@react-router/node	Major
@react-router/dev	Major
react-router	Major
@react-router/serve	Major
@react-router/architect	Major
@react-router/fs-routes	Major
@react-router/remix-config-routes-adapter	Major
@react-router/cloudflare	Major
react-router-dom	Major

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[brophdawg11]

I'm not quite sure why this is still needed - but unit tests fail without it - maybe a jsdom issue?

>  pnpm test packages/react-router/__tests__/router/navigation-test.ts
...
  ● navigations › navigation states › loader submission + redirect

    ReferenceError: Request is not defined

      4978 |   }
      4979 |
    > 4980 |   return new Request(url, init);
           |   ^
      4981 | }
      4982 |
      4983 | function convertFormDataToSearchParams(formData: FormData): URLSearchParams {

      at createClientSideRequest (lib/router/router.ts:4980:3)
      at createClientSideRequest (lib/router/router.ts:1560:19)
      at Object.startNavigation [as navigate] (lib/router/router.ts:1411:11)
      at Object.navigate (__tests__/router/utils/data-router-setup.ts:642:19)
      at Object.navigate (__tests__/router/navigation-test.ts:1250:23)

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