[Merged by Bors] - send attnet unsubscription event on random subnet expiry #3600
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Issue Addressed
🐞 in which we don't actually unsubscribe from a random long lived subnet when it expires
Proposed Changes
Remove code addressing a specific case in which we are subscribed to all subnets and handle the removal of the long lived subnet. I don't think the special case code is particularly important as, if someone is running with that many validators to be subscribed to all subnets, it should use
--subscribe-all-subnets
insteadAdditional Info
Noticed on some test nodes climbing bandwidth usage periodically (around 27hours, the time of subnet expirations) I'm running this code to test this does not happen anymore, but I think it should be good now