fix spotless by using convent over config principle

Author: Vincent Potucek

build-conventions/src/main/java/org/elasticsearch/gradle/internal/conventions/precommit/FormattingPrecommitPlugin.java

@@ -57,7 +57,6 @@ public void apply(Project project) {
                 String importOrderPath = "build-conventions/elastic.importorder";
                 String formatterConfigPath = "build-conventions/formatterConfig.xml";
 
-                java.target("src/**/*.java");
                 java.removeUnusedImports();
 
                 // We enforce a standard order for imports