OZG-4993 OZG-5213 Move kcAdminClient authentication to AuthenticationService

.../src/lib/keycloak-admin/keycloak-admin.repository.spec.ts

...tings/src/lib/keycloak-admin/keycloak-admin.repository.ts

.../lib/oeid/oeid-container/oeid-container.component.spec.ts

...s/src/lib/oeid/oeid-container/oeid-container.component.ts

alfa-client/libs/admin-settings/test/keycloak/keycloak.ts

alfa-client/libs/authentication/jest.config.ts

...ibs/authentication/src/lib/authentication.service.spec.ts

...ent/libs/authentication/src/lib/authentication.service.ts

alfa-client/libs/authentication/test/authentication.ts