[HUDI-1504] Allow log files generated during restore/rollback to be synced as well

- TestHoodieBackedMetadata#testSync etc now run for MOR tables
 - HUDI-1502 is still pending and has issues for MOR/rollbacks
 - Also addressed bunch of code review comments.

hudi-client/hudi-client-common/src/main/java/org/apache/hudi/client/CompactionAdminClient.java

@@ -481,11 +481,6 @@ public class CompactionAdminClient extends AbstractHoodieClient {
     throw new HoodieException("FileGroupId " + fgId + " not in pending compaction");
   }
 
-  @Override
-  protected void initWrapperFSMetrics() {
-    // no-op
-  }
-
   /**
    * Holds Operation result for Renaming.
    */

hudi-client/hudi-client-common/src/main/java/org/apache/hudi/table/HoodieTimelineArchiveLog.java

@@ -88,11 +88,6 @@ public class HoodieTimelineArchiveLog<T extends HoodieAvroPayload, I, K, O> {
   private final HoodieTable<T, I, K, O> table;
   private final HoodieTableMetaClient metaClient;
 
-  /*
-  public HoodieTimelineArchiveLog(HoodieWriteConfig config, Configuration configuration) {
-    this(config, HoodieTable.create(config, configuration));
-  }*/
-
   public HoodieTimelineArchiveLog(HoodieWriteConfig config, HoodieTable<T, I, K, O> table) {
     this.config = config;
     this.table = table;