Arkindex deployment validation procedure

Refs https://redmine.teklia.com/issues/8008

When a sysadmin builds a new Arkindex instance, it is extremely useful to guide them through a serie of validation step of increasing complexity.

A new page describing all these checks and their reason to be must be created as /deployment/validation

Steps:

1. Admin login
   • to validate DB connectivity, DB migrations super-user creation
2. User creation in admin
   • to validate form submission from the backend (CSRF issues)
3. Login through frontend
   • to validate frontend => API usage & CORS issues
4. Reset password
   • to validate email account
5. Upload image onto staging bucket (no import)
   • to validate minio/bucket storage & CORS issues
6. Import images
   • using the previously uploaded file
   • to validate a ponos worker is available & features are setup
   • usually this is the most complex step
7. Inference process with tesseract
   • to validate workers through ponos
8. Search indexation
   • to validate search engine & admin usage
9. Data export
   • to validate export workers & storage on bucket
10. Django cleanup
    • to validate it's setup as cron
11. Production mode
    • just to make sure the website is not running in debug mode, exposing credentials