Fix tiering add-column IT to supply new column values

Author: buvb

fluss-lake/fluss-lake-paimon/src/test/java/org/apache/fluss/lake/paimon/tiering/PaimonTieringITCase.java

@@ -635,7 +635,9 @@ void testTieringWithAddColumn() throws Exception {
             admin.alterTable(tablePath, addColumnChanges, false).get();
 
             // 6. Write more data after ADD COLUMN (with new column value)
-            List<InternalRow> newRows = Arrays.asList(row(4, "v4"), row(5, "v5"), row(6, "v6"));
+            // schema now has 3 business columns (c1, c2, c3), so provide value for the new column
+            List<InternalRow> newRows =
+                    Arrays.asList(row(4, "v4", 40), row(5, "v5", 50), row(6, "v6", 60));
             writeRows(tablePath, newRows, true);
 
             // 7. Wait for new data to be tiered