node: drop support for static & trusted node list files (#25610)

This changes the node setup to ignore datadir files

    static-nodes.json
    trusted-nodes.json

When these files are present, it an error will be printed to the log.

node/node.go

@@ -133,12 +133,7 @@ func New(conf *Config) (*Node, error) {
 	node.server.Config.PrivateKey = node.config.NodeKey()
 	node.server.Config.Name = node.config.NodeName()
 	node.server.Config.Logger = node.log
-	if node.server.Config.StaticNodes == nil {
-		node.server.Config.StaticNodes = node.config.StaticNodes()
-	}
-	if node.server.Config.TrustedNodes == nil {
-		node.server.Config.TrustedNodes = node.config.TrustedNodes()
-	}
+	node.config.checkLegacyFiles()
 	if node.server.Config.NodeDatabase == "" {
 		node.server.Config.NodeDatabase = node.config.NodeDB()
 	}