### What problem does this PR solve?
Update for Admin UI:
- Update file picker input in **Registration whitelist** > **Import from
Excel** modal
- Modify DOM structure of **Sandbox Settings** and move several
hardcoded texts into translation files
### Type of change
- [x] Refactoring
### What problem does this PR solve?
- Modify and adjust styles (CSS vars, components) to match the design
system
- Adjust file and directory structure of admin UI
### Type of change
- [x] Refactoring
### What problem does this PR solve?
Add whitelist management and role management in Admin UI
### Type of change
- [x] New Feature (non-breaking change which adds functionality)
### What problem does this PR solve?
- Fix login card will overlap title in admin login page.
- Disable unnecessary `listRoles()` query in user management page and
create user form
- Disable admin UI API queries and mutations retry mechanism
- Fix page not redirect to login page automatically if API reports
unauthorized (401)
- Fix change password form not reset when change password modal close
- Resolve admin UI content (mostly long texts) may break layout main box
issue
### Type of change
- [x] Bug Fix (non-breaking change which fixes an issue)
