Move noisy, non-fatal Pipeline info log to debug (#5601)

Signed-off-by: Simon Dudley <simon.dudley@consensys.net>

services/pipeline/src/main/java/org/hyperledger/besu/services/pipeline/Pipeline.java

@@ -169,7 +169,7 @@ public class Pipeline<I> {
             if (tracingEnabled) {
               taskSpan.setStatus(StatusCode.ERROR);
             }
-            LOG.info("Unhandled exception in pipeline. Aborting.", t);
+            LOG.debug("Unhandled exception in pipeline. Aborting.", t);
             try {
               abort(t);
             } catch (final Throwable t2) {