fix: move ingress-nginx config to values file, remove --wait

--set with memory values like '90Mi' can be misparsed by Helm's
value parser. Move resources to k8s/ingress-nginx-values.yaml.

Remove --wait: it blocks until the LoadBalancer gets an external IP,
which can exceed 5m on GCP and fail the job. The controller pods
starting is enough; the LB IP is assigned asynchronously.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>