[DNM]Test the flaky test reindextable_while_reindex_idx_aoco_part_btree in CI

Author: jiaqizho

src/test/isolation2/expected/reindex/reindextable_while_reindex_idx_aoco_part_btree.out

@@ -45,6 +45,22 @@ INSERT 12
 -- of one column.
 -- See https://github.com/apache/cloudberry/issues/26#issuecomment-1682097755
 -- for more details.
+3: select dbid,count(distinct relfilenode) as cnt, relname from old_relfilenodes group by dbid, relname order by 1,2,3;
+ dbid | cnt | relname                                             
+------+-----+-----------------------------------------------------
+ -1   | 1   | reindex_crtab_part_aoco_btree_1_prt_p_one_id_idx    
+ -1   | 1   | reindex_crtab_part_aoco_btree_id_idx                
+ -1   | 2   | reindex_crtab_part_aoco_btree_1_prt_de_fault_id_idx 
+ 0    | 1   | reindex_crtab_part_aoco_btree_1_prt_p_one_id_idx    
+ 0    | 1   | reindex_crtab_part_aoco_btree_id_idx                
+ 0    | 2   | reindex_crtab_part_aoco_btree_1_prt_de_fault_id_idx 
+ 1    | 1   | reindex_crtab_part_aoco_btree_1_prt_p_one_id_idx    
+ 1    | 1   | reindex_crtab_part_aoco_btree_id_idx                
+ 1    | 2   | reindex_crtab_part_aoco_btree_1_prt_de_fault_id_idx 
+ 2    | 1   | reindex_crtab_part_aoco_btree_1_prt_p_one_id_idx    
+ 2    | 1   | reindex_crtab_part_aoco_btree_id_idx                
+ 2    | 2   | reindex_crtab_part_aoco_btree_1_prt_de_fault_id_idx 
+(12 rows)
 3: select relname, relname = 'reindex_crtab_part_aoco_btree_1_prt_p_one_id_idx' and res.cnt in (1, 2) as special_case_for_p_one_id_idx, case when relname = 'reindex_crtab_part_aoco_btree_1_prt_p_one_id_idx' then -1 else res.cnt end as count from (select distinct count(distinct relfilenode) as cnt, relname from old_relfilenodes group by dbid, relname) as res;
  relname                                             | special_case_for_p_one_id_idx | count 
 -----------------------------------------------------+-------------------------------+-------

src/test/isolation2/sql/reindex/reindextable_while_reindex_idx_aoco_part_btree.sql

@@ -42,6 +42,7 @@ DELETE FROM reindex_crtab_part_aoco_btree  WHERE id < 128;
 -- of one column.
 -- See https://github.com/apache/cloudberry/issues/26#issuecomment-1682097755
 -- for more details.
+3: select dbid,count(distinct relfilenode) as cnt, relname from old_relfilenodes group by dbid, relname order by 1,2,3;
 3: select relname,
           relname = 'reindex_crtab_part_aoco_btree_1_prt_p_one_id_idx' and res.cnt in (1, 2) as special_case_for_p_one_id_idx,
           case