Add flag for whether an OR conn "counts" for bootstrap tracking
We set this flag if we've launched the connection in order to satisfy an origin circuit, or when we decide the connection would satisfy an origin circuit. These are the only or_connections we want to consider for bootstrapping: other or_connections are opened because of client EXTEND requests, and they may succeed or fail because of the clients' confusion or misconfiguration.
Closes #25061 (closed).