Merge bitcoin/bitcoin#25853: net: update testnet torv3 hardcoded seeds for 24.x

2ef33e936eaf1058086169b5833f196ff624bf89 contrib: update testnet torv3 hardcoded seeds (Jon Atack)

Pull request description:

  As a follow-up to https://github.com/bitcoin/bitcoin/issues/13550 and #22060, replace the mostly unreachable testnet torv3 hardcoded seeds from v0.22 with new ones that are consistently reachable recently and that have service bit 1 set.

  This needs to be done before v24.0 to make sure onion-only testnet nodes can still connect to the network.

  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
  - Re-compile and create a new testnet node with `bitcoind -testnet -dnsseed=0 -onlynet=onion -proxy=127.0.0.1:9050` (or delete `~/.bitcoin/testnet3/peers.dat` and launch bitcoind with `-testnet -dnsseed=0`). Make sure there are no `addnode=` in your `bitcoin.conf`. The debug log should print "Adding fixed seeds".  Check if the node is able to connect to the network and get blocks with for ex. `watch -t ./src/bitcoin-cli -testnet -rpcwait -netinfo 4`
  - Check the addrman contains the seeds by running for ex. `bitcoin-cli -rpcwait -testnet getnodeaddresses 0 onion | jq -r '.[] | (.address + ":" + (.port|tostring) + " " + (.services|tostring))' | sort`

  - Check if the addresses are connectable, for ex. with this python script by laanwj:

  ```python3
  #!/usr/bin/env python3
  import pprint
  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):
          pprint.pprint(line)
          subprocess.call(["nc", "-v", "-x", "127.0.0.1:9050", "-z"] + line.split(':'))
  ```

  Thanks to satsie (Stacie Waleyko) for help with the list.

ACKs for top commit:
  satsie:
    ACK 2ef33e936eaf1058086169b5833f196ff624bf89
  laanwj:
    ACK 2ef33e936eaf1058086169b5833f196ff624bf89

Tree-SHA512: 72d27ecba243089bd49c11e921855fba626a1e09ae9b17508254a3bbec4bec341ed6c3d5a4eabc2d37f20bafb8a47ecc7d125e0dda956512a9525ad83273ffd6

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