message: fuzz: addrman fuzz tests: override-able check ratio
  Make it possible to override from the command line (without recompiling)
  the addrman check ratio in addrman fuzz tests instead of hardcoding it
  to 0:
  ```
  FUZZ=addrman ./src/test/fuzz/fuzz --checkaddrman=5
  ```
diff: #include <test/fuzz/FuzzedDataProvider.h>
  #include <test/fuzz/fuzz.h>
  #include <test/fuzz/util.h>
  +#include <test/util/setup_common.h>
  #include <time.h>
  #include <util/asmap.h>
  +#include <util/system.h>
  #include <cassert>
  #include <cstdint>
  #include <string>
  #include <vector>
  +namespace {
  +const BasicTestingSetup* g_setup;
  +
  +int32_t GetCheckRatio()
  +{
  + return std::clamp<int32_t>(g_setup->m_node.args->GetIntArg("-checkaddrman", 0), 0, 1000000);
  +}
  +} // namespace
  +
  void initialize_addrman()
  {
  - SelectParams(CBaseChainParams::REGTEST);
  + static const auto testing_setup = MakeNoLogFileContext<>(CBaseChainParams::REGTEST);
  + g_setup = testing_setup.get();
  }
  FUZZ_TARGET_INIT(data_stream_addr_man, initialize_addrman)
  {
  FuzzedDataProvider fuzzed_data_provider{buffer.data(), buffer.size()};
  CDataStream data_stream = ConsumeDataStream(fuzzed_data_provider);
  - AddrMan addr_man(/*asmap=*/std::vector<bool>(), /*deterministic=*/false, /*consistency_check_ratio=*/0);
  + AddrMan addr_man{/*asmap=*/std::vector<bool>(), /*deterministic=*/false, GetCheckRatio()};
  try {
  ReadFromStream(addr_man, data_stream);
  } catch (const std::exception&) {
  @@ -113,7 +125,7 @@ class AddrManDeterministic : public AddrMan
  {
  public:
  explicit AddrManDeterministic(std::vector<bool> asmap, FuzzedDataProvider& fuzzed_data_provider)
  - : AddrMan(std::move(asmap), /*deterministic=*/true, /*consistency_check_ratio=*/0)
  + : AddrMan{std::move(asmap), /*deterministic=*/true, GetCheckRatio()}
  {
  WITH_LOCK(m_impl->cs, m_impl->insecure_rand = FastRandomContext{ConsumeUInt256(fuzzed_data_provider)});
  }
  