[ATR-28063] Print passing chains on HLT truncation

When a HLT truncation occurs, it can be useful to see which chains accepted the event.

It is likely that one of these is responsible for causing the excessive reconstruction output which resulted in the truncation (but it could also be a chain which made lots of stuff and then failed...)

As we use TrigComposites to save the summary for offline, we can also put the IDs easily in here. Offline we don't have immediate access to the reverse-hashing so we just print the numeric chain IDs.