multi: add new config QuiescenceTimeout

This commit makes removes the `defaultQuiescenceTimeout` and makes it
configurable as different nodes have different network environment. In
addition the default timeout has been increased from 30s to 60s.

htlcswitch/quiescer.go

@@ -47,13 +47,9 @@ var (
 
 	// ErrQuiescenceTimeout indicates that the quiescer has been quiesced
 	// beyond the allotted time.
-	ErrQuiescenceTimeout = fmt.Errorf(
-		"quiescence timeout",
-	)
+	ErrQuiescenceTimeout = fmt.Errorf("quiescence timeout")
 )
 
-const defaultQuiescenceTimeout = 30 * time.Second
-
 type StfuReq = fn.Req[fn.Unit, fn.Result[lntypes.ChannelParty]]
 
 // Quiescer is the public interface of the quiescence mechanism. Callers of the