enable configmap creation and bump chart to v0.16.0-rc.2

[chanwit]

Fixes #828
Fixes #831

[yitsushi]

lgtm, but

I would still include the following changes:

internal/config/config.go:

-	config := Config{}
+	config := Config{
+		Resources: []types.NamespacedName{
+			{Namespace: RuntimeNamespace()},
+		},
+	}

internal/server/polling/config.go:

 func (s *Server) readConfig(ctx context.Context) (*config.Config, error) {
 	configMap, err := config.ReadConfig(ctx, s.clusterClient, s.configMapRef)
 	if err != nil {
-		return nil, fmt.Errorf("unable to read ConfigMap: %w", err)
+		s.log.Error(err, "failed ot read config")
 	}
 
 	return &configMap, nil

and someone in the informer the same logic.

Reading config can fail only in two cases:

1. Failed to Get the ConfigMap.
2. Failed to Unmarshal the content of the ConfigMap.

in both cases, we can use a default value.