v25.11.1 crash

[b0a7]

Describe the bug
I believe this is caused by having one of the nodes connected to the validator client offline when the validator client is starting up

To Reproduce
Steps to reproduce the behavior: start validator client v25.11.1 with one of the connected nodes offline

1. Platform details (OS, architecture): Ubuntu
2. Branch/commit used: statusim/nimbus-validator-client:multiarch-v25.11.1
3. Commands being executed: '...'
4. Relevant log lines:
   rocketpool_validator | /home/user/nimbus-eth2/vendor/nim-serialization/serialization/errors.nim(453) main
   rocketpool_validator | /home/user/nimbus-eth2/vendor/nim-serialization/serialization/errors.nim(441) NimMain
   rocketpool_validator | /home/user/nimbus-eth2/beacon_chain/nimbus_validator_client.nim(660) _ZN23nimbus_validator_client4mainE
   rocketpool_validator | /home/user/nimbus-eth2/vendor/nim-chronos/chronos/internal/asyncfutures.nim(518) _ZN12asyncfutures7waitForE20InternalRaisesFutureI4void4voidE
   rocketpool_validator | /home/user/nimbus-eth2/vendor/nim-chronos/chronos/internal/asyncfutures.nim(635) _ZN12asyncfutures7pollForE20InternalRaisesFutureI4void4voidE
   rocketpool_validator | /home/user/nimbus-eth2/vendor/nim-chronos/chronos/internal/asyncengine.nim(150) _ZN11asyncengine4pollE
   rocketpool_validator | /home/user/nimbus-eth2/vendor/nim-chronos/chronos/internal/asyncfutures.nim(382) _ZN12asyncfutures14futureContinueE3refIN7futures26FutureBasecolonObjectType_EE
   rocketpool_validator | /home/user/nimbus-eth2/vendor/nim-chronicles/chronicles/formats.nim(20) _ZN13runVCSlotLoop13runVCSlotLoopE3refIN7futures26FutureBasecolonObjectType_EE
   rocketpool_validator | /home/user/nimbus-eth2/beacon_chain/validator_client/common.nim(923) _ZN6common28getDurationToNextAttestationE3refIN6common15ValidatorClientEEN9constants4SlotE
   rocketpool_validator | /home/user/nimbus-eth2/beacon_chain/validator_client/common.nim(892) _ZN6common11forkAtEpochE3refIN6common15ValidatorClientEEN9constants5EpochE
   rocketpool_validator | /home/user/nimbus-eth2/vendor/nimbus-build-system/vendor/Nim/lib/std/assertions.nim(41) _ZN10assertions16failedAssertImplE6string
   rocketpool_validator | /home/user/nimbus-eth2/vendor/nimbus-build-system/vendor/Nim/lib/std/assertions.nim(36) _ZN10assertions11raiseAssertE6string
   rocketpool_validator | /home/user/nimbus-eth2/vendor/nimbus-build-system/vendor/Nim/lib/system/fatal.nim(53) _ZN10assertions8sysFatalE8typeDescIN10exceptions15AssertionDefectEE6string
   rocketpool_validator | /home/user/nimbus-eth2/vendor/nimbus-build-system/vendor/Nim/lib/system/excpt.nim(349) _ZN6system18rawWriteStackTraceE3varI3seqIN6system15StackTraceEntryEEE
   rocketpool_validator | /home/user/nimbus-eth2/vendor/nimbus-build-system/vendor/Nim/lib/system/stacktraces.nim(62) _ZN11stacktraces30auxWriteStackTraceWithOverrideE3varI3seqIN6system15StackTraceEntryEEE
   rocketpool_validator | [[reraised from:
   rocketpool_validator | /home/user/nimbus-eth2/vendor/nim-serialization/serialization/errors.nim(453) main
   rocketpool_validator | /home/user/nimbus-eth2/vendor/nim-serialization/serialization/errors.nim(441) NimMain
   rocketpool_validator | /home/user/nimbus-eth2/beacon_chain/nimbus_validator_client.nim(660) _ZN23nimbus_validator_client4mainE
   rocketpool_validator | /home/user/nimbus-eth2/vendor/nim-chronos/chronos/internal/asyncfutures.nim(518) _ZN12asyncfutures7waitForE20InternalRaisesFutureI4void4voidE
   rocketpool_validator | /home/user/nimbus-eth2/vendor/nim-chronos/chronos/internal/asyncfutures.nim(635) _ZN12asyncfutures7pollForE20InternalRaisesFutureI4void4voidE
   rocketpool_validator | /home/user/nimbus-eth2/vendor/nim-chronos/chronos/internal/asyncengine.nim(150) _ZN11asyncengine4pollE
   rocketpool_validator | /home/user/nimbus-eth2/vendor/nim-chronos/chronos/internal/asyncfutures.nim(382) _ZN12asyncfutures14futureContinueE3refIN7futures26FutureBasecolonObjectType_EE
   rocketpool_validator | /home/user/nimbus-eth2/beacon_chain/nimbus_validator_client.nim(243) _ZN13runVCSlotLoop13runVCSlotLoopE3refIN7futures26FutureBasecolonObjectType_EE
   rocketpool_validator | /home/user/nimbus-eth2/vendor/nimbus-build-system/vendor/Nim/lib/system/stacktraces.nim(62) _ZN11stacktraces30auxWriteStackTraceWithOverrideE3varI3seqIN6system15StackTraceEntryEEE
   rocketpool_validator | ]]
   rocketpool_validator | [[reraised from:
   rocketpool_validator | /home/user/nimbus-eth2/vendor/nim-serialization/serialization/errors.nim(453) main
   rocketpool_validator | /home/user/nimbus-eth2/vendor/nim-serialization/serialization/errors.nim(441) NimMain
   rocketpool_validator | /home/user/nimbus-eth2/beacon_chain/nimbus_validator_client.nim(660) _ZN23nimbus_validator_client4mainE
   rocketpool_validator | /home/user/nimbus-eth2/vendor/nim-chronos/chronos/internal/asyncfutures.nim(518) _ZN12asyncfutures7waitForE20InternalRaisesFutureI4void4voidE
   rocketpool_validator | /home/user/nimbus-eth2/vendor/nim-chronos/chronos/internal/asyncfutures.nim(635) _ZN12asyncfutures7pollForE20InternalRaisesFutureI4void4voidE
   rocketpool_validator | /home/user/nimbus-eth2/vendor/nim-chronos/chronos/internal/asyncengine.nim(150) _ZN11asyncengine4pollE
   rocketpool_validator | /home/user/nimbus-eth2/vendor/nim-chronos/chronos/internal/asyncfutures.nim(382) _ZN12asyncfutures14futureContinueE3refIN7futures26FutureBasecolonObjectType_EE
   rocketpool_validator | /home/user/nimbus-eth2/beacon_chain/nimbus_validator_client.nim(244) _ZN13runVCSlotLoop13runVCSlotLoopE3refIN7futures26FutureBasecolonObjectType_EE
   rocketpool_validator | /home/user/nimbus-eth2/vendor/nimbus-build-system/vendor/Nim/lib/system/stacktraces.nim(62) _ZN11stacktraces30auxWriteStackTraceWithOverrideE3varI3seqIN6system15StackTraceEntryEEE
   rocketpool_validator | ]]
   rocketpool_validator | Error: unhandled exception: /home/user/nimbus-eth2/beacon_chain/validator_client/common.nim(891, 11) len(vc.forks) > 0 [AssertionDefect]
   rocketpool_validator exited with code 1 (restarting)

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