Use actually distinct webhook for Autopilot

[zmerlynn]

The sasecret-redacter webhook will be a stable indicator until we have a more robust way.

The webhook I implemented in #3032 is sadly present on GKE Standard as well (my bad).

Replaces #3033
Closes #3034

[google-oss-prow]

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[agones-bot]

Build Succeeded 👏

Build Id: 2a70c99a-0006-401d-8a02-b2ea5e23b2e3

The following development artifacts have been built, and will exist for the next 30 days:

• image: us-docker.pkg.dev/agones-images/ci/agones-controller:1.31.0-f8e890e-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.31.0-f8e890e-linux-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.31.0-f8e890e-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.31.0-f8e890e-amd64
• Linux C++ SDK (build): agonessdk-1.31.0-f8e890e-amd64-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.31.0-f8e890e-amd64.zip

A preview of the website (the last 30 builds are retained):

• https://f8e890e-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/3035/head:pr_3035 && git checkout pr_3035
• helm install agones ./install/helm/agones --namespace agones-system --agones.image.release=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.31.0-f8e890e-amd64