Merge bitcoin/bitcoin#22179: Torv2 removal followups

00b875ba94 addrman: remove invalid addresses when unserializing (Vasil Dimov)
bdb62096f0 fuzz: reduce possible networks check (Vasil Dimov)
a164cd3ba6 net: simplify CNetAddr::IsRoutable() (Vasil Dimov)

Pull request description:

  * Simplify some code, now that we know `CNetAddr::IsRFC4193()` and `CNetAddr::IsTor()` cannot be `true` at the same time.
  * Drop Tor v2 addresses when loading addrman from `peers.dat` - they would have been loaded as dummy-all-zeros IPv6 addresses and linger in addrman, wasting space.

ACKs for top commit:
  sipa:
    ACK 00b875ba94. Reviewed the code, and tested with -DDEBUG_ADDRMAN (unit tests + mainnet run with peers.dat that contained v2 onions).
  laanwj:
    Code review and lightly tested ACK 00b875ba94
  jonatack:
    ACK 00b875ba94 reviewed, debug-built with -DEBUG_ADDRMAN rebased to current master, restarted node on mainnet/signet/testnet and verified that on each chain -addrinfo shows no change in address counts (as expected). Added some sanity check asserts, rebuilt/re-ran test. Checked that the new test fails on master with "test/addrman_tests.cpp(824): error: in "addrman_tests/remove_invalid": check addrman.size() == 2 has failed [4 != 2]"
  jarolrod:
    ACK 00b875ba94

Tree-SHA512: 6ed8e6745134b1b94fffaba28482de909ea39483b46b7f57bda61cdbae7a51251d15cb674de3631772fbeabe153d77a19269f96e62a89102a2d5c01e48f0ba06

src/addrman.cpp

@@ -77,6 +77,38 @@ double CAddrInfo::GetChance(int64_t nNow) const
     return fChance;
 }
 
+void CAddrMan::RemoveInvalid()
+{
+    for (size_t bucket = 0; bucket < ADDRMAN_NEW_BUCKET_COUNT; ++bucket) {
+        for (size_t i = 0; i < ADDRMAN_BUCKET_SIZE; ++i) {
+            const auto id = vvNew[bucket][i];
+            if (id != -1 && !mapInfo[id].IsValid()) {
+                ClearNew(bucket, i);
+            }
+        }
+    }
+
+    for (size_t bucket = 0; bucket < ADDRMAN_TRIED_BUCKET_COUNT; ++bucket) {
+        for (size_t i = 0; i < ADDRMAN_BUCKET_SIZE; ++i) {
+            const auto id = vvTried[bucket][i];
+            if (id == -1) {
+                continue;
+            }
+            const auto& addr_info = mapInfo[id];
+            if (addr_info.IsValid()) {
+                continue;
+            }
+            vvTried[bucket][i] = -1;
+            --nTried;
+            SwapRandom(addr_info.nRandomPos, vRandom.size() - 1);
+            vRandom.pop_back();
+            mapAddr.erase(addr_info);
+            mapInfo.erase(id);
+            m_tried_collisions.erase(id);
+        }
+    }
+}
+
 CAddrInfo* CAddrMan::Find(const CNetAddr& addr, int* pnId)
 {
     AssertLockHeld(cs);