Change useScrollRestoration to use pagehide event

[brophdawg11]

pagehide seems to be a better cross-browser way of detecting the unload of a page. And in the case of scroll restoration there's no need to ever prompt the user so pagehide seems a better option anyway.

From https://developer.mozilla.org/en-US/docs/Web/API/Window/unload_event#usage_notes:

If you're specifically trying to detect page unload events, the pagehide event is the best option.

Closes #9463

[changeset-bot]

🦋 Changeset detected

Latest commit: 67dd17f

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

This PR includes changesets to release 4 packages

Name	Type
react-router-dom	Patch
react-router	Patch
react-router-dom-v5-compat	Patch
react-router-native	Patch

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[brophdawg11]

Not exported currently - but if this is indeed a better way to save off some data, maybe we should export it and make a note in the docs about the use-case difference between the two hooks?

[github-actions]

🤖 Hello there,

We just published version 6.7.1-pre.0 which includes this pull request. If you'd like to take it for a test run please try it out and let us know what you think!

Thanks!

[github-actions]

🤖 Hello there,

We just published version 6.8.0 which includes this pull request. If you'd like to take it for a test run please try it out and let us know what you think!

Thanks!