Delete unused e2e test cluster

[gongmax]

What type of PR is this?

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/kind breaking
/kind bug

/kind cleanup

/kind documentation
/kind feature
/kind hotfix

What this PR does / Why we need it:

Which issue(s) this PR fixes:

Closes #

Special notes for your reviewer:

[agones-bot]

Build Succeeded 👏

Build Id: 66bb13de-d71d-46be-977b-d112928cd563

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-a5940a6-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.31.0-a5940a6-linux-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.31.0-a5940a6-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.31.0-a5940a6-amd64
• Linux C++ SDK (build): agonessdk-1.31.0-a5940a6-amd64-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.31.0-a5940a6-amd64.zip

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

• https://a5940a6-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/3017/head:pr_3017 && git checkout pr_3017
• 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-a5940a6-amd64

[google-oss-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: gongmax, zmerlynn
Once this PR has been reviewed and has the lgtm label, please assign alekser for approval. For more information see the Kubernetes Code Review Process.

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[agones-bot]

Build Succeeded 👏

Build Id: a3d0774b-44e4-4144-ac8d-33835332cf2d

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:1.31.0-6446d02-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.31.0-6446d02-linux-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.31.0-6446d02-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.31.0-6446d02-amd64
• Linux C++ SDK (build): agonessdk-1.31.0-6446d02-amd64-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.31.0-6446d02-amd64.zip

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

• https://6446d02-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/3017/head:pr_3017 && git checkout pr_3017
• helm install agones ./install/helm/agones --namespace agones-system --agones.image.release=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.31.0-6446d02-amd64