[Maintenance] Keycloak custom mappers

[devtobi]

Relevant template

No response

Problem description (optional)

Currently our user object in refarch/frontend/types/User.ts contains lots of metadata which come from our internal SSO provider. However we should modify our local keycloak stack to provide this data as well (dummy data).
Missing information in the local stack will lead to errors in the frontend, because User object cannot be constructed safely.

Desired solution

Modify the local keycloak stack to reproduce our company internal user information.

Considered alternatives (optional)

No response

Additional context (optional)

No response

No duplicate

• I confirm that this issue is not a duplicate

Code of Conduct

• I agree to follow this project's Code of Conduct