join reorder using greedy algorithm use wrong rule for the cost of limit operator

## Bug Report

Please answer these questions before submitting your issue. Thanks!

### 1. Minimal reproduce step (Required)

### 2. What did you expect to see? (Required)

```
EXPLAIN SELECT rel.date_updated, rel.sign_no, rel.cust_no, info.medium_name AS agree_medium_name, info.medium_class AS agree_medium_class
, rel.medium_biz_no AS biz_no, '' AS agree_biz_sub_no, '2' AS meta_type, rel.`status`, rel.sign_date
, rel.term_date
FROM carc_cust_medium_rel rel
INNER JOIN (
SELECT sign_no
FROM carc_cust_medium_rel
LIMIT 20
) rep
ON rep.sign_no = rel.sign_no
LEFT JOIN carc_medium_info info ON info.`id` = rel.medium_id;

mysql> explain SELECT rel.date_updated, rel.sign_no, rel.cust_no, info.medium_name AS agree_medium_name, info.medium_class AS agree_medium_class, rel.medium_biz_no AS biz_no, '' AS agree_biz_sub_no, '2' AS meta_type, rel.`status`, rel.sign_date, rel.term_date FROM carc_cust_medium_rel rel INNER JOIN (SELECT sign_no FROM carc_cust_medium_rel LIMIT 20) rep ON rep.sign_no = rel.sign_no LEFT JOIN carc_medium_info info ON info.`id` = rel.medium_id;
+----------------------------------------+---------+-----------+----------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| id | estRows | task | access object | operator info |
+----------------------------------------+---------+-----------+----------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Projection_13 | 21.15 | root | | carc.carc_cust_medium_rel.date_updated, carc.carc_cust_medium_rel.sign_no, carc.carc_cust_medium_rel.cust_no, carc.carc_medium_info.medium_name, carc.carc_medium_info.medium_class, carc.carc_cust_medium_rel.medium_biz_no, ->Column#64, 2->Column#65, carc.carc_cust_medium_rel.status, carc.carc_cust_medium_rel.sign_date, carc.carc_cust_medium_rel.term_date |
| └─IndexJoin_17 | 21.15 | root | | left outer join, inner:IndexLookUp_16, outer key:carc.carc_cust_medium_rel.medium_id, inner key:carc.carc_medium_info.id, equal cond:eq(carc.carc_cust_medium_rel.medium_id, carc.carc_medium_info.id) |
| ├─IndexHashJoin_33(Build) | 21.14 | root | | inner join, inner:IndexLookUp_30, outer key:carc.carc_cust_medium_rel.sign_no, inner key:carc.carc_cust_medium_rel.sign_no, equal cond:eq(carc.carc_cust_medium_rel.sign_no, carc.carc_cust_medium_rel.sign_no) |
| │ ├─Limit_42(Build) | 20.00 | root | | offset:0, count:20 |
| │ │ └─IndexReader_48 | 20.00 | root | | index:Limit_47 |
| │ │ └─Limit_47 | 20.00 | cop[tikv] | | offset:0, count:20 |
| │ │ └─IndexFullScan_45 | 20.00 | cop[tikv] | table:carc_cust_medium_rel, index:PRIMARY(sign_no) | keep order:false |
| │ └─IndexLookUp_30(Probe) | 20.00 | root | | |
| │ ├─IndexRangeScan_28(Build) | 20.00 | cop[tikv] | table:rel, index:PRIMARY(sign_no) | range: decided by [eq(carc.carc_cust_medium_rel.sign_no, carc.carc_cust_medium_rel.sign_no)], keep order:false |
| │ └─TableRowIDScan_29(Probe) | 20.00 | cop[tikv] | table:rel | keep order:false |
| └─IndexLookUp_16(Probe) | 21.14 | root | | |
| ├─IndexRangeScan_14(Build) | 21.14 | cop[tikv] | table:info, index:PRIMARY(id) | range: decided by [eq(carc.carc_medium_info.id, carc.carc_cust_medium_rel.medium_id)], keep order:false |
| └─TableRowIDScan_15(Probe) | 21.14 | cop[tikv] | table:info | keep order:false |
+----------------------------------------+---------+-----------+----------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
13 rows in set (0.00 sec)

```

### 3. What did you see instead (Required)

```
mysql> explain SELECT rel.date_updated, rel.sign_no, rel.cust_no, info.medium_name AS agree_medium_name, info.medium_class AS agree_medium_class, rel.medium_biz_no AS biz_no, '' AS agree_biz_sub_no, '2' AS meta_type, rel.`status`, rel.sign_date, rel.term_date FROM carc_cust_medium_rel rel INNER JOIN (SELECT sign_no FROM carc_cust_medium_rel LIMIT 20) rep ON rep.sign_no = rel.sign_no LEFT JOIN carc_medium_info info ON info.`id` = rel.medium_id;
+----------------------------------+-------------+-----------+----------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| id | estRows | task | access object | operator info |
+----------------------------------+-------------+-----------+----------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Projection_15 | 21.15 | root | | carc.carc_cust_medium_rel.date_updated, carc.carc_cust_medium_rel.sign_no, carc.carc_cust_medium_rel.cust_no, carc.carc_medium_info.medium_name, carc.carc_medium_info.medium_class, carc.carc_cust_medium_rel.medium_biz_no, ->Column#64, 2->Column#65, carc.carc_cust_medium_rel.status, carc.carc_cust_medium_rel.sign_date, carc.carc_cust_medium_rel.term_date |
| └─HashJoin_17 | 21.15 | root | | inner join, equal:[eq(carc.carc_cust_medium_rel.sign_no, carc.carc_cust_medium_rel.sign_no)] |
| ├─Limit_37(Build) | 20.00 | root | | offset:0, count:20 |
| │ └─IndexReader_43 | 20.00 | root | | index:Limit_42 |
| │ └─Limit_42 | 20.00 | cop[tikv] | | offset:0, count:20 |
| │ └─IndexFullScan_40 | 20.00 | cop[tikv] | table:carc_cust_medium_rel, index:PRIMARY(sign_no) | keep order:false |
| └─HashJoin_31(Probe) | 12951356.78 | root | | left outer join, equal:[eq(carc.carc_cust_medium_rel.medium_id, carc.carc_medium_info.id)] |
| ├─TableReader_36(Build) | 10125212.00 | root | | data:TableFullScan_35 |
| │ └─TableFullScan_35 | 10125212.00 | cop[tikv] | table:info | keep order:false |
| └─TableReader_34(Probe) | 12951092.00 | root | | data:TableFullScan_33 |
| └─TableFullScan_33 | 12951092.00 | cop[tikv] | table:rel | keep order:false |
+----------------------------------+-------------+-----------+----------------------------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
11 rows in set (0.00 sec)
```

I expect the join order for that query is: rel (limit20) INNER JOIN rel LEFT JOIN info
But the actual order is rel LEFT JOIN info INNER JOIN rel (limit 20)

### 4. What is your TiDB version? (Required)

master

```
mysql> select tidb_version();
+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| tidb_version() |
+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| Release Version: v8.2.0-alpha-382-gd1f2671557-dirty
Edition: Community
Git Commit Hash: d1f2671557726507cc2ded1e4cc989a9ac55f8bb
Git Branch: master
UTC Build Time: 2024-06-19 14:59:48
GoVersion: go1.21.0
Race Enabled: false
Check Table Before Drop: false
Store: unistore |
+--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
```