OZG-4321 remove deprecated config

alfa-client/apps/admin/src/app/app.config.ts

-import { Environment } from '@alfa-client/environment-shared';
-import { KeycloakService } from 'keycloak-angular';
-
-export function initializeKeycloak(keycloak: KeycloakService, envConfig: Environment) {
-  return () =>
-    keycloak.init({
-      config: {
-        url: envConfig.authServer,
-        realm: envConfig.realm,
-        clientId: envConfig.clientId,
-      },
-      initOptions: {
-        adapter: 'default',
-        checkLoginIframe: false,
-        enableLogging: true,
-        scope: 'offline_access',
-        onLoad: 'login-required',
-        silentCheckSsoRedirectUri: window.location.origin + '/assets/silent-check-sso.html',
-        silentCheckSsoFallback: true,
-      },
-      updateMinValidity: 1,
-      bearerExcludedUrls: ['/assets', '/clients/public'],
-    });
-}