Merge bitcoin/bitcoin#30008: seeds: Pull additional nodes from my seeder and update fixed seeds

41ad84a00c20f54b520aab7f6f975231da0ee2d0 seeds: Use fjahr's more up to date asmap (Ava Chow)
d8fd1e0fafa144a9ff96fc646cf9f21e220d5cd6 seeds: Fixed seeds update (Ava Chow)
f1f24d72141dcd2955420195135cabe5092017ff seeds: Add testnet4 fixed seeds file (Ava Chow)
8ace71c73750e3b537784178f3fc299447c461ed seeds: Remove manual onion and i2p seeds (Ava Chow)
ed5b86cbe47676276f8ff1a48001d5ecd560e153 seeds: Add testnet instructions (Ava Chow)
0676515397fcc8fb580973047e60279ce65bec48 seeds: Also pull from achow101 seeder (Ava Chow)
5bab3175a663610070c1000dd4211a58490e5023 makeseeds: Configurable minimum blocks for testnet4's smaller chain (Ava Chow)
d2465dfac68f96ffdaad88a0bd4891ed37cbfdfc makeseeds: Shuffle ips after parsing (Ava Chow)
af550b3a0fd406f175f197ea9867b41ff4e97af4 makeseeds: Support CJDNS (Ava Chow)
d5a8c4c4bd76f296f4d744184dc80a6a6a0731bd makeseeds: Update user agent regex (Ava Chow)

Pull request description:

  The [DNS seeder](https://github.com/achow101/dnsseedrs) that I wrote collects statistics on node reliability in the same way that sipa's seeder does, and also outputs this information in the same file format. Thus it can also be used in our fixed seeds update scripts. My seeder additionally crawls onion v3, i2p, and cjdns, so will now be able to set those fixed seeds automatically rather than curating manual lists.

  In doing this update, I've found that `makeseeds.py` is missing newer versions from the regex as well as cjdns support; both of these have been updated.

  I also noticed that the testnet fixed seeds are all manually curated and sipa's seeder does not appear to publish any testnet data. Since I am also running the seeder for testnet, I've added the commands to generate testnet fixed seeds from my seeder's data too.

  Lastly, I've updated all of the fixed seeds. However, since my seeder has not found any cjdns nodes that met the reliability criteria (possibly due to connectivity issues present in those networks), I've left the previous manual seeds for that network.

ACKs for top commit:
  fjahr:
    re-ACK 41ad84a00c20f54b520aab7f6f975231da0ee2d0
  virtu:
    ACK [41ad84a](https://github.com/bitcoin/bitcoin/commit/41ad84a00c20f54b520aab7f6f975231da0ee2d0)

Tree-SHA512: 6ba0141f053d9d6ae7d8c9574f061be38f3e65b28de1d6660c1885ab942623b5a0ec70754b4fcfc5d98fe970f5f179a940d5880b5061ed698f7932500e01d3ee

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