chore: drop defunct onion seeds, add new existing onion hosts as seeds

As of today, all of these are able to be connected to on port 9999; I've not actually connected to all of them and verified they're on latest core or something like that; but their addresses my core knows about, and are able to be trivially connected to

contrib/seeds/onion_seeds.txt

@@ -1,25 +1,46 @@
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