fix: add decision step between header sync and pruned/archival #3546
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Description
DecideNextSync
step that is responsible for finding a suitable peer for block/pruned syncMotivation and Context
When transitioning to header sync, the listening state would filter out peers that have a suitable horizon height.
However any peer regardless of pruned height can provide headers for header sync.
How Has This Been Tested?
Sync tests
Manually