Fix 919 provider crash

[TBeijen]

Fix for #919

Always refresh token after create realm.

Rationale is this should not be expensive since:

• Creating a realm is relatively rare
• In a lot of scenarios the token refresh would happen anyway if a new realm is created, when it's referenced elsewhere

Existing acceptance test testKeycloakDefaultRoles_basic should cover this, provided the acceptance tests include Keycloak v22 and newer. For that, the following PRs exist:

• 921 Test Keycloak images for v22 & v23

• 920 Include v22 in acc. tests (draft, pending #921)