fix: use official kubectl image for CRD installer job

[sanmesh-kakade]

Summary

• bitnami/kubectl:1.31.4 does not exist on Docker Hub, causing ImagePullBackOff on the gateway API CRD installer job
• Switched to the official distroless image registry.k8s.io/kubectl:v1.31.4
• Updated command/args since the distroless image has no /bin/sh — invokes kubectl directly with separate args

Test plan

• Verified manually on cluster: job completes successfully with the new image
• Confirm Terraform plan shows only the image and command change

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✨ Finishing touches

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