Retry build cancellation if it fails

[zmerlynn]

Fix flakes such as https://console.cloud.google.com/cloud-build/builds/88c9df84-6445-48dd-bcf7-aab5e2dfe483?project=258182270954

[google-oss-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: gongmax, zmerlynn
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[agones-bot]

Build Failed 😱

Build Id: 60ead405-58c3-4dad-b335-6e6e91d1c1ec

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• Cloud Build log download

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[agones-bot]

Build Succeeded 👏

Build Id: d497c001-e30d-4651-9ccd-04d49e4809b1

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:1.31.0-2be15db-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.31.0-2be15db-linux-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.31.0-2be15db-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.31.0-2be15db-amd64
• Linux C++ SDK (build): agonessdk-1.31.0-2be15db-amd64-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.31.0-2be15db-amd64.zip

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

• https://2be15db-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/3073/head:pr_3073 && git checkout pr_3073
• helm install agones ./install/helm/agones --namespace agones-system --agones.image.release=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.31.0-2be15db-amd64