Flaky test: Portal State - Random node lookup from each node.

[jangko]

[Suite] Portal testnet tests
  [OK] Discv5 - RoutingTableInfo at start
  [OK] Discv5 - Random node lookup from each node
  [OK] Portal State - RoutingTableInfo at start
{"code":-32000,"message":"portal_state_lookupEnr raised an exception","data":"Record not found in DHT lookup."}
    /home/runner/work/nimbus-eth1/nimbus-eth1/fluffy/scripts/test_portal_testnet.nim(114, 16): Check failed: enr == nodeInfo.nodeENR
    enr was (0)
    nodeInfo.nodeENR was (1, id: "v4", ip: 127.0.0.10, secp256k1: 0x0365DD989C9B9B74DA568EE572585BE6E9151E7C18F515CEE37E7749204A873BB6, udp: 9009)
{"code":-32000,"message":"portal_state_lookupEnr raised an exception","data":"Record not found in DHT lookup."}
    /home/runner/work/nimbus-eth1/nimbus-eth1/fluffy/scripts/test_portal_testnet.nim(114, 16): Check failed: enr == nodeInfo.nodeENR
    enr was (0)
    nodeInfo.nodeENR was (1, id: "v4", ip: 127.0.0.8, secp256k1: 0x026DB3F86661F6F5A626EFBD70CE245A9332E2B0F4E467B6ECC3A4EC9FAB38A023, udp: 9007)
{"code":-32000,"message":"portal_state_lookupEnr raised an exception","data":"Record not found in DHT lookup."}
    /home/runner/work/nimbus-eth1/nimbus-eth1/fluffy/scripts/test_portal_testnet.nim(114, 16): Check failed: enr == nodeInfo.nodeENR
    enr was (0)
    nodeInfo.nodeENR was (1, id: "v4", ip: 127.0.0.10, secp256k1: 0x0365DD989C9B9B74DA568EE572585BE6E9151E7C18F515CEE37E7749204A873BB6, udp: 9009)
  [FAILED] Portal State - Random node lookup from each node
  [OK] Portal History - RoutingTableInfo at start
  [OK] Portal History - Random node lookup from each node
Error: Process completed with exit code 1.

It fails in different configuration at different time:
linux-i386: https://github.com/status-im/nimbus-eth1/runs/4932202504?check_suite_focus=true
macos-amd64: https://github.com/status-im/nimbus-eth1/runs/4914514536?check_suite_focus=true

[kdeme]

Should be resolved with #953