[bug]: Remove Soft-Error Handling during ChannelLink reestablishment.

[ziggie1984]

• We introduced soft error-handling because of other implementations sending us errors although the channel was still fully functional and could recover after restart. For more background see: C-lightning sending permanent channel failure on failed gossip sync ElementsProject/lightning#4212
  We should Force-Close the channel as soon as we receive an error to be spec. compliant.

• Moreover we need to also rethink our strategy of Force-Closing the channel if the next_commitment_number = 0because dual-funding has some use-cases where the commitment number is set to 0 and we should not force close the channel.
  For more info see: Do not unnecessarily retransmit commitment_signed in dual funding lightning/bolts#1214 (comment)