feat: Sync channel eagerly when proposing a rollover

Analogue to what we do when opening a position. We check if the contract is confirmed. If not, we sync eagerly - thus increasing the chances that the rollover proposal will succeed.

This covers a small edge case where the user opened a position right before the rollover window and the coordinator hasn't synced yet.

coordinator/src/node/rollover.rs

@@ -180,6 +180,14 @@ impl Node {
     ) -> Result<()> {
         let trader_pubkey = position.trader;
 
+        if !self
+            .inner
+            .check_if_signed_channel_is_confirmed(trader_pubkey)
+            .await?
+        {
+            bail!("Cannot rollover a contract that is not confirmed");
+        }
+
         let next_expiry = commons::calculate_next_expiry(OffsetDateTime::now_utc(), network);
 
         let (oracle_pk, contract_tx_fee_rate) = {