Better Exception Message for users.xml Loading Error Due to Bad Password Hash

Why it matters

This feature enhances the error reporting when the users.xml file cannot be loaded because of a bad password hash. It helps users quickly identify authentication configuration issues and reduces troubleshooting time.

How to use it

No user action is required to enable this feature. When a password hash in users.xml is incorrect, ClickHouse will display a clearer and more informative exception message during startup or user configuration reload.