[Bug]: all internal tables/database can be delete/drop...etc

[heni02]

Is there an existing issue for the same bug?

• [X] I have checked the existing issues.

Environment

- Version or commit-id (e.g. v0.1.0 or 8b23a93):
- Hardware parameters:
- OS type:
- Others:

Actual Behavior

delete from mo_user; drop internal databases drop database information_schema;

Expected Behavior

No response

Steps to Reproduce

No response

Additional information

No response

[daviszhen]

if was fixed at #5587

[heni02]

confirm, closed