fix: check if keycloak groups exist and improve logging

[nanu-c]

Type of change

• [X] Bug fix (non-breaking change which fixes an issue)
• [X] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

Description

IMPORTANT TO KNOW

CHANGES

• This adds the customer to the correct subgroup.
• Add a lot of keycloak tests
• loads env vars in keycloak via the config package
• Ensures that all keycloak groups exists on start of app TODO

Checklist:

• [x] I have commented my code (or ChatGPT did), particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings, neither in my IDE nor in my browser
• [x] I have added tests that prove my fix is effective or that my feature works

[nanu-c]

I have one final question/thought:

1. Shouldn't we add the new keycloak environment variables to our `.env.examples` like 'KEYCLOAK_CUSTOMER_GROUP' ?
   Besides this, I could even see the two testing versions in our keycloak GUI being created, which is really nice! :)
   ![image](https://private-user-images.githubusercontent.com/38591956/292177267-264428d8-2236-450c-97d7-1328b121e506.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.CRDyR1hLvekBu5SYWOfhk65AX8tCar4whrZsmTaJZMw)

maybe we should do this, but who will change it? Is it necessary that it's configurable?

[lebe1]

I have one final question/thought:

1. Shouldn't we add the new keycloak environment variables to our `.env.examples` like 'KEYCLOAK_CUSTOMER_GROUP' ?
   Besides this, I could even see the two testing versions in our keycloak GUI being created, which is really nice! :)
   ![image](https://private-user-images.githubusercontent.com/38591956/292177267-264428d8-2236-450c-97d7-1328b121e506.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.CRDyR1hLvekBu5SYWOfhk65AX8tCar4whrZsmTaJZMw)

maybe we should do this, but who will change it? Is it necessary that it's configurable?

I don't think it is necessary that it is configurable and it also might be that this variable won't ever be changed again, which probably goes along for a few other variables in the .env.example. But since this variable is defined in the configs and every other variable is in the .env.example I think by being consistent and having each variable in the .env.example is better practice... ?

[nanu-c]

I have added an issue for this #156