test(react): Ensure react router 3 tests always have correct types

[mydea]

Noticed this failing every now and then locally. After looking into this, I found this to be a bit weird anyhow:

1. We used react-router-5 types for react-router 4, seems off 🤔 I adjusted this to v4
2. We used to add the @types/react-router-v3 alias in package.json, but this was not being picked up anyhow properly. The reason is that this version of the types package basically re-exports a bunch of stuff from a path like react-router/lib which our resolution then sometimes (?) picks up from the v6 react-router package. Which is also why we had to overwrite this somehow, which is what sometimes failed (?). Now, we simply define these types in test/globals.d.ts properly, the same way as before, but there should be no more conflicts and we can safe installing one unecessary package.