Remove more hidden file leniency from plugins

This commit removes one more instance of leniency from the plugin
service which skips hidden files in the plugins directory.

Relates #23982

core/src/main/java/org/elasticsearch/plugins/PluginsService.java

@@ -270,9 +270,6 @@ public class PluginsService extends AbstractComponent {
         Set<Bundle> bundles = new LinkedHashSet<>();
         try (DirectoryStream<Path> stream = Files.newDirectoryStream(modulesDirectory)) {
             for (Path module : stream) {
-                if (FileSystemUtils.isHidden(module)) {
-                    continue; // skip over .DS_Store etc
-                }
                 PluginInfo info = PluginInfo.readFromProperties(module);
                 Set<URL> urls = new LinkedHashSet<>();
                 // gather urls for jar files