Merge bitcoin/bitcoin#22060: contrib: add torv3 seed nodes for testnet, drop v2 ones

6fe05168587ee818e6ae4483a5984a5893131e44 contrib: add torv3 seed nodes for testnet, drop v2 ones (Jon Atack)

Pull request description:

  Replace the ancient (2015) Tor V2 hardcoded seeds with new Tor V3 ones. This needs to be done before 0.22 to make sure onion-only testnet nodes can still connect to the network. Continues #21560.

  Ways to test:
  - Re-generate ` src/chainparamsseeds.h` with `cd contrib/seeds && python3 generate-seeds.py . > ../../src/chainparamsseeds.h`, check if git tree stays the same.
  - Create a new testnet node with `bitcoind -testnet -onlynet=onion -proxy=127.0.0.1:9050` (or delete `~/.bitcoin/testnet3/peers.dat`), check if it is able to connect to the network and get blocks.
  - Check if the addresses are connectable for ex.:
  ```python3
  #!/usr/bin/env python3
  import subprocess
  with open('contrib/seeds/nodes_test.txt') as f:
      for line in (line for line in (line.rstrip().split('#', 1)[0] for line in f) if line):
          subprocess.call(["nc", "-v", "-x", "127.0.0.1:9050", "-z"] + line.split(':'))
  ```

  Thanks to jonatack for providing the list.

ACKs for top commit:
  jonatack:
    ACK 6fe05168587ee818e6ae4483a5984a5893131e44

Tree-SHA512: 61bfdb44dfab9d02b75e5cb06c089a3b1a1fe7134875e1d09166c4116e961d809aa25422fe03f068876e9423b571ecc4a0c7a7eeacba4aac3b2768717f3ee6d6

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