Replace infinite scroll with pagination

[matthew-white]

This issue is to replace the infinite scroll on the Submissions page and the Entity Data page with pagination. That's called for in the release criteria for v2025.1 and should also help a lot with performance on those pages.

Note that we have an existing Pagination component that we can use for this.

[matthew-white]

@lognaturel mentioned that one way that infinite scroll is useful is that users can search for particular text within the larger number of submissions on the page. We discussed that we could make the maximum page size selectable in the pagination component something large so that that type of searching is still easy to do. At some point, maybe we'll add a way for Backend to search submissions.