Enabled cross-subdomain console sessions by making the cookie domain configurable and aligning the frontend so it reads the shared CSRF cookie. (#27190)

docker/docker-compose-template.yaml

@@ -81,6 +81,7 @@ services:
     environment:
       CONSOLE_API_URL: ${CONSOLE_API_URL:-}
       APP_API_URL: ${APP_API_URL:-}
+      NEXT_PUBLIC_COOKIE_DOMAIN: ${NEXT_PUBLIC_COOKIE_DOMAIN:-}
       SENTRY_DSN: ${WEB_SENTRY_DSN:-}
       NEXT_TELEMETRY_DISABLED: ${NEXT_TELEMETRY_DISABLED:-0}
       TEXT_GENERATION_TIMEOUT_MS: ${TEXT_GENERATION_TIMEOUT_MS:-60000}