Remove legacy log4j-1.2 dependencies completely (elastic#132238)

Author: Rassyan

x-pack/plugin/security/src/main/java/module-info.java

@@ -23,7 +23,6 @@
     requires org.apache.httpcomponents.httpclient;
     requires org.apache.httpcomponents.httpasyncclient;
     requires org.apache.httpcomponents.httpcore.nio;
-    requires org.apache.log4j;
     requires org.apache.logging.log4j;
     requires org.apache.logging.log4j.core;
     requires org.apache.lucene.core;