[Enhancement](compaction) set status to ok for alternating rowsets compaction

be/src/cloud/cloud_cumulative_compaction.cpp

@@ -91,6 +91,7 @@ Status CloudCumulativeCompaction::prepare_compact() {
             // plus 1 to skip the delete version.
             // NOTICE: after that, the cumulative point may be larger than max version of this tablet, but it doesn't matter.
             update_cumulative_point();
+            return Status::OK();
         }
         return st;
     }

be/src/olap/cumulative_compaction.cpp

@@ -173,8 +173,7 @@ Status CumulativeCompaction::pick_rowsets_to_compact() {
             // plus 1 to skip the delete version.
             // NOTICE: after that, the cumulative point may be larger than max version of this tablet, but it doesn't matter.
             tablet()->set_cumulative_layer_point(_last_delete_version.first + 1);
-            return Status::Error<CUMULATIVE_NO_SUITABLE_VERSION>(
-                    "_last_delete_version.first not equal to -1");
+            return Status::OK();
         }
 
         // we did not meet any delete version. which means compaction_score is not enough to do cumulative compaction.