Update React

[AlanGreene]

Update to the next major React release (currently v18, v19 may be released soon)

A number of other dependencies will also need to be updated at the same time:

• @tanstack/react-query@5
  • v5 drops support for React 17
  • most of the preparation already done as part of React Router v6 update in Update to use React Router data router APIs #3465 and related issues. Remaining config changes described below
  • originally described in Update React Router to v6 #2452 (comment)
  • https://tanstack.com/query/latest/docs/framework/react/guides/migrating-to-v5
    • rename cacheTime to gcTime
    • rename isLoading to isPending
      • also renames status: loading to status: pending, and isInitialLoading to isLoading
      • can we stick with isLoading for most of our use cases? (the new isLoading is isPending && isFetching)
      • see the 'status: pending' section of v5 Roadmap 🗺 TanStack/query#4252 for details
  • minimum react version 18.2.0
• @testing-library/react@13 or later
  • v13 drops support for React 17
• ?