fix: remove stale entry in subscription map and update filter ping interval #1119
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While dogfooding filter, noticed that there is a stale entry left in subscriptions map if all subscriptions to a peer are unsubscribed. This was leading to sending un-necessary pings leading to 404 error.
Added logic to remove from the map.
Also, realized the fliter ping interval is too aggresive i.e 5 seconds and increased it to 1 minute.