show memory_table regions return unexpected result

## Bug Report

Please answer these questions before submitting your issue. Thanks!

### 1. Minimal reproduce step (Required)

```sql
show table information_schema.tables regions;
```

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

empty result. since `information_schema.tables` is a memory table, it shouldn't have any data in any tikv region.

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

```sql
+-----------+--------------------+----------+-----------+-----------------+-------+------------+---------------+------------+----------------------+------------------+------------------------+------------------+
| REGION_ID | START_KEY | END_KEY | LEADER_ID | LEADER_STORE_ID | PEERS | SCATTERING | WRITTEN_BYTES | READ_BYTES | APPROXIMATE_SIZE(MB) | APPROXIMATE_KEYS | SCHEDULING_CONSTRAINTS | SCHEDULING_STATE |
+-----------+--------------------+----------+-----------+-----------------+-------+------------+---------------+------------+----------------------+------------------+------------------------+------------------+
| 52 | t_281474976710654_ | 78000000 | 53 | 1 | 53 | 0 | 0 | 1872000 | 1 | 477 | | |
+-----------+--------------------+----------+-----------+-----------------+-------+------------+---------------+------------+----------------------+------------------+------------------------+------------------+
```

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

```sql
+-----------------------------------------------------------+
| tidb_version() |
+-----------------------------------------------------------+
| Release Version: v8.0.0-alpha-143-g7087f70 |
| Edition: Community |
| Git Commit Hash: 7087f702e18f811c98d5a276eace7bb69292c6aa |
| Git Branch: HEAD |
| UTC Build Time: 2024-01-30 03:53:25 |
| GoVersion: go1.21.4 |
| Race Enabled: false |
| Check Table Before Drop: false |
| Store: tikv |
+-----------------------------------------------------------+
```