gossipd: tell lightningd about all our previous channel_updates at startup #6456
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This will at least help the case where these were not populated, causing us to send errors without channel_updated appended.
It's not perfect: we can still send such errors if the gossip store is corrupted, and we still send them for private channels, but it should help.
(The much better fix is far more invasive, so slips to next release!)
See: #5822