Test: increase authentication logging for debugging

This commit increases the logging for authentication in the x-pack
multi-node qa test project. This is needed to assist in debugging HTTP
authorization failures in waiting for the second node in these tests.

See #30306

Author: jaymode

x-pack/qa/multi-node/build.gradle

@@ -12,6 +12,7 @@ integTestCluster {
   setting 'xpack.watcher.enabled', 'false'
   setting 'xpack.monitoring.enabled', 'false'
   setting 'xpack.ml.enabled', 'false'
+  setting 'logger.org.elasticsearch.xpack.security.authc', 'TRACE'
   extraConfigFile 'roles.yml', 'roles.yml'
   setupCommand 'setup-test-user', 'bin/elasticsearch-users', 'useradd', 'test-user', '-p', 'x-pack-test-password', '-r', 'test'
   setupCommand 'setup-super-user', 'bin/elasticsearch-users', 'useradd', 'super-user', '-p', 'x-pack-super-password', '-r', 'superuser'