Adjust tiering add-column IT to expect actual column names

Author: buvb

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

@@ -649,8 +649,8 @@ void testTieringWithAddColumn() throws Exception {
             FileStoreTable paimonTable = (FileStoreTable) paimonCatalog.getTable(tableIdentifier);
             List<String> fieldNames = paimonTable.rowType().getFieldNames();
 
-            // Should have: c1, c2, c3, __bucket, __offset, __timestamp
-            assertThat(fieldNames).contains("c1", "c2", "c3");
+            // Should have: a, b, c3, __bucket, __offset, __timestamp
+            assertThat(fieldNames).contains("a", "b", "c3");
 
             // 9. Verify all data is present in Paimon (no data loss)
             List<InternalRow> allRows = new ArrayList<>();