[Merged by Bors] - Do not try to sync over transient connections #5603
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Motivation
Transient connections are relayed connections which should only be used for hole punching. Trying to sync over them never succeeds due to resource limits, etc.
Description
Do not try to use transient connections for sync.
Test Plan
Verified by syncing a node with routing discovery and relay enabled, so that hole punching is happening continuously and there are always some temporary relayed connections.
Writing a proper test case for this change is possible in theory, but it's a little too involved compared to the change itself as it requires starting a relay host, obtaining a reservation with it, etc.