Add startup logging for standalone tests

We need to investigate why startup is taking so long in CI for
standalone tests. This commit adds logging for bootstrap and network
code that is executed before the node starts initializing in case this
is the source of the trouble.

Relates #28659

buildSrc/src/main/groovy/org/elasticsearch/gradle/test/NodeInfo.groovy

@@ -163,6 +163,7 @@ class NodeInfo {
         }
 
         env = ['JAVA_HOME': project.runtimeJavaHome]
+        args.addAll("-E", "logger.org.elasticsearch.bootstrap=debug", "-E", "logger.org.elasticsearch.common.network=debug")
         args.addAll("-E", "node.portsfile=true")
         String collectedSystemProperties = config.systemProperties.collect { key, value -> "-D${key}=${value}" }.join(" ")
         String esJavaOpts = config.jvmArgs.isEmpty() ? collectedSystemProperties : collectedSystemProperties + " " + config.jvmArgs