Use DEBUG level log when F3 is not ready for participation (#12700)

To reduce log verbosity change the log level for message indicating that
F3 is not ready for participation yet. Because, the participation logic
will reattempt after some backoff and these logs may at times become too
verbose.

Fixes #12688

chain/lf3/participation.go

@@ -193,7 +193,7 @@ func (p *Participant) tryParticipate(ctx context.Context, ticket api.F3Participa
 			log.Debugw("Reattempting F3 participation with the same ticket.", "attempts", p.backoff.Attempt())
 			continue
 		case errors.Is(err, api.ErrF3NotReady):
-			log.Warnw("F3 is not ready. Retrying F3 participation after backoff.", "backoff", p.backoff.Duration(), "err", err)
+			log.Debugw("F3 is not ready. Retrying F3 participation after backoff.", "backoff", p.backoff.Duration(), "err", err)
 			p.backOff(ctx)
 			continue
 		case err != nil: