information_schema.resource_groups allows unauthorized data access

## Bug Report

Please answer these questions before submitting your issue. Thanks!

### 1. Minimal reproduce step (Required)

```
-- connect as root
CREATE USER foo;
CREATE RESOURCE GROUP admin_group RU_PER_SEC=20000 BURSTABLE;
ALTER USER 'root' RESOURCE GROUP admin_group;

-- connect as foo
SELECT * FROM INFORMATION_SCHEMA.RESOURCE_GROUPS WHERE NAME = 'admin_group';
```
### 2. What did you expect to see? (Required)
```
MySQL [(none)]> SELECT * FROM INFORMATION_SCHEMA.RESOURCE_GROUPS WHERE NAME = 'admin_group';
Empty set (0.001 sec)
```
### 3. What did you see instead (Required)
```
MySQL [(none)]> SELECT * FROM INFORMATION_SCHEMA.RESOURCE_GROUPS WHERE NAME = 'admin_group';
+-------------+------------+----------+-----------+-------------+------------+
| NAME | RU_PER_SEC | PRIORITY | BURSTABLE | QUERY_LIMIT | BACKGROUND |
+-------------+------------+----------+-----------+-------------+------------+
| admin_group | 20000 | MEDIUM | YES | NULL | NULL |
+-------------+------------+----------+-----------+-------------+------------+
1 row in set (0.001 sec)
```
### 4. What is your TiDB version? (Required)

```
Release Version: v9.0.0-beta.1
Edition: Community
Git Commit Hash: 7aff918dcbfa6facf2adef9ade9961c40f217421
Git Branch: HEAD
UTC Build Time: 2025-03-24 09:09:55
GoVersion: go1.23.7
Race Enabled: false
Check Table Before Drop: false
Store: unistore
```