feat: improve error handling and logging in RecoveryWarningNotificationJob

- Replace getSystemValue with getSystemValueBool for dry-run setting
- Add comprehensive try-catch blocks around all operations
- Add missing success logging for user disable/delete operations
- Improve error messages with better context and exception details
- Add user existence validation before operations
- Enhance file operation error handling in logUserAction
- Standardize exception handling using \Throwable throughout
- Add proper error handling for directory creation and file writing