Fix scroll restoration in the Pagination component

[blittle]

WHY are these changes introduced?

Fix the Pagination component to always restore scroll correctly on back/forth navigation.

Expected behavior and design considerations

This fix has the side effect of causing a hydration error only when the user refreshes an already paginated page. This is because during a refresh, the Paginated list is rendered with the browser's navigation state, not the state returned by the server. Navigation state might contain many pages of data, all of which is necessary to properly render the page height and restore scroll position. The result is a hydration mismatch between the browser and the server. We feel it isn't often the user would hard refresh the page, and when doing so, a hydration mismatch and flash of rendered content is an acceptable tradeoff for accurately maintaining the scroll location.

HOW to test your changes?

On the /products page as well as the /collections/:handle do the following tasks (the collection page paginated on scroll):

1. Load pages all the way until it ends. Make sure there are no duplicate items in the list.
2. Navigate to a product towards the end of the list. Then click the back button. Scroll should exactly restore.
3. Make sure at the end of the list the Load more button does not show up.
4. Go the end of the list. Copy the URL, and paste it in an incognito tab. Click the previous button until it disappears (it should disappear once you reach the start of the list). Make sure there are no duplicates in the list.
5. Disable JavaScript. You should be able to navigate between pages.

Another thing I already tested, but if you want to go the extra mile, create a link on a collection page to another collection page. Paginate through one collection page, then click a link to directly go to another collection page (same route, different params). Make sure that products don't bleed between the pages and pagination state is reset.

Checklist

• I've read the Contributing Guidelines
• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've added a changeset if this PR contains user-facing or noteworthy changes
• I've added tests to cover my changes
• I've added or updated the documentation

[juanpprieto]

🙏🏼