Merge bitcoin/bitcoin#27374: p2p: skip netgroup diversity of new connections for tor/i2p/cjdns

b5585ba5f97a19d1b435d9ab69b5a55cfd45dd70 p2p: skip netgroup diversity of new connections for tor/i2p/cjdns networks (stratospher)

Pull request description:

  Follow up for #27264.

  In order to make sure that our persistent outbound slots belong to different netgroups, distinct net groups of our peers are added to `setConnected`. We’d only open a persistent outbound connection to peers which have a different netgroup compared to those netgroups present in `setConnected`.

  Current `GetGroup()` logic assumes route-based diversification behaviour for tor/i2p/cjdns addresses (addresses are public key based and not route-based). Distinct netgroups possible (according to the current `GetGroup()` logic) for:
  1. tor => 030f, 031f, .. 03ff (16 possibilities)
  2. i2p => 040f, 041f, .. 04ff (16 possibilities)
  3. cjdns => 05fc0f, 05fc1f, ... 05fcff (16 possibilities)

  `setConnected` is used in `ThreadOpenConnections()` before making [outbound](https://github.com/bitcoin/bitcoin/blob/84f4ac39fda7ffa5dc84e92d92dd1eeeb5e20f8c/src/net.cpp#L1846) and [anchor](https://github.com/bitcoin/bitcoin/blob/84f4ac39fda7ffa5dc84e92d92dd1eeeb5e20f8c/src/net.cpp#L1805) connections to new peers so that they belong to distinct netgroups.

  **behaviour on master**

  - if we run a node only on tor/i2p/cjdns
  - we wouldn't be able to open more than 16 outbound connections(manual, block-relay-only anchor, outbound full relay, block-relay-only connections) because we run out of possible netgroups.
  - see https://github.com/bitcoin/bitcoin/pull/27264#issuecomment-1481322628
  - tested by changing `MAX_OUTBOUND_FULL_RELAY_CONNECTIONS` to 17 with `onlynet=onion` and observed how node wouldn't make more than 16 outbound connections.

  **behaviour on PR**

  - netgroup diversity checks are skipped for tor/i2p/cjdns addresses.
  - we don't insert tor/i2p/cjdns address in `setConnected` and `GetGroup` doesn't get called on tor/i2p/cjdns(see #27369)

ACKs for top commit:
  achow101:
    ACK b5585ba5f97a19d1b435d9ab69b5a55cfd45dd70
  mzumsande:
    ACK b5585ba5f97a19d1b435d9ab69b5a55cfd45dd70
  vasild:
    ACK b5585ba5f97a19d1b435d9ab69b5a55cfd45dd70

Tree-SHA512: c120b3f9ca7f0be3f29ea665cd2f7dfb40cd1d7ec7058984252fb6e0295e414f736c5b4fba03c31188188a5ae4f543fb2654f6ee9776bad745c7ca72d23d5b9b

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