Sync log4j2.xml file with defaults from the server repo (#277)

* Sync log4j2.xml file with defaults from the server repo

Refs Graylog2/graylog2-server#20607

* Set log level for org.apache.iceberg.CatalogUtil to warn

* Set log level of org.apache.iceberg.IncrementalFileCleanup to warn

config/log4j2.xml

@@ -9,6 +9,7 @@
         <Memory name="graylog-internal-logs" bufferSizeBytes="20MB">
             <PatternLayout pattern="%d{yyyy-MM-dd'T'HH:mm:ss.SSSXXX} %-5p [%c{1}] %m%n"/>
         </Memory>
+
     </Appenders>
     <Loggers>
         <!-- Application Loggers -->
@@ -37,6 +38,16 @@
         <Logger name="org.apache.hadoop" level="warn"/>
         <Logger name="org.apache.parquet.hadoop.InternalParquetRecordReader" level="warn"/>
         <Logger name="org.apache.avro.Schema" level="error"/>
+        <!-- Silence Selenium log chatter -->
+        <Logger name="org.openqa.selenium.devtools.Connection" level="warn"/>
+        <!-- Silence Apache Iceberg log chatter -->
+        <Logger name="org.apache.iceberg.BaseMetastoreCatalog" level="warn"/>
+        <Logger name="org.apache.iceberg.BaseMetastoreTableOperations" level="warn"/>
+        <Logger name="org.apache.iceberg.CatalogUtil" level="warn"/>
+        <Logger name="org.apache.iceberg.IncrementalFileCleanup" level="warn"/>
+        <Logger name="org.apache.iceberg.SnapshotProducer" level="warn"/>
+        <Logger name="org.apache.iceberg.SnapshotScan" level="warn"/>
+        <Logger name="org.apache.iceberg.metrics.LoggingMetricsReporter" level="warn"/>
         <Root level="warn">
             <AppenderRef ref="STDOUT"/>
             <AppenderRef ref="graylog-internal-logs"/>