fix: change log level because behavior is expected (argoproj#16124)

Signed-off-by: spaced <spaced.wombat@gmail.com>

Author: spaced

workflow/controller/operator.go

@@ -2094,7 +2094,7 @@ func (woc *wfOperationCtx) executeTemplate(ctx context.Context, nodeName string,
 	node, err = woc.wf.GetNodeByName(nodeName)
 	if err != nil {
 		// Will be initialized via woc.initializeNodeOrMarkError
-		woc.log.Warn(ctx, "Node was nil, will be initialized as type Skipped")
+		woc.log.Info(ctx, "Node was nil, will be initialized as type Skipped")
 	}
 
 	if node != nil {

workflow/executor/executor.go

@@ -214,7 +214,7 @@ func (we *WorkflowExecutor) loadArtifact(ctx context.Context, pluginName wfv1.Ar
 
 	if !art.HasLocationOrKey() {
 		if art.Optional {
-			logger.WithField("name", art.Name).Warn(ctx, "Ignoring optional artifact which was not supplied")
+			logger.WithField("name", art.Name).Info(ctx, "Ignoring optional artifact which was not supplied")
 			return nil
 		}
 		return argoerrs.Errorf(argoerrs.CodeNotFound, "required artifact '%s' not supplied", art.Name)