Do not run `forced_canonicalization` for archive nodes (#13051)

We don't canonicalize on archive nodes and thus `best_canonical` always returned `None`. So, the
moment such a node tried to force canonicalize, it was trapped in some endless loop.

This pr solves this by renaming `best_canonical` to `last_canonicalized` and also making the return
value more clear by introducing a custom enum `LastCanonicalized`.