Refactor setupNetworkProviders as it affects when forking a chain

[abarmat]

trafficstars

function setupNetworkProviders(hardhatConfig) {
  for (const netConfig of networkConfigs) {
    hardhatConfig.networks[netConfig.network] = {
      chainId: netConfig.chainId,
      url: netConfig.url ? netConfig.url : getDefaultProviderURL(netConfig.network),
      gas: netConfig.gas || 'auto',
      gasPrice: netConfig.gasPrice || 'auto',
      accounts: {
        mnemonic: getAccountMnemonic(),
      },
    }
  }
}

The accounts entry affects how hardhat verifies that a sending account is a hosted private key.

[abarmat]

The address book also gets in the way of having a proper env when forking