e2e: Add --cloud-product flag, add SkipOnCloudProduct

[zmerlynn]

• Adds a simple --cloud-product flag to the e2e with no enforcement of validity.

• Adds a SkipOnCloudProduct convenience function, and 2 callers.

Towards #2777

[agones-bot]

Build Succeeded 👏

Build Id: cef9e219-9a6b-4253-b3b0-3a532636b19f

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:1.29.0-b1a750d-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.29.0-b1a750d-linux-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.29.0-b1a750d-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.29.0-b1a750d-amd64
• Linux C++ SDK (build): agonessdk-1.29.0-b1a750d-amd64-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.29.0-b1a750d-amd64.zip

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

• https://b1a750d-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/2886/head:pr_2886 && git checkout pr_2886
• helm install agones ./install/helm/agones --namespace agones-system --agones.image.release=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.29.0-b1a750d-amd64

[agones-bot]

Build Succeeded 👏

Build Id: f9fee748-896b-4f4c-8b7f-ec081227d907

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:1.29.0-c02de7e-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.29.0-c02de7e-linux-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.29.0-c02de7e-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.29.0-c02de7e-amd64
• Linux C++ SDK (build): agonessdk-1.29.0-c02de7e-amd64-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.29.0-c02de7e-amd64.zip

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

• https://c02de7e-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/2886/head:pr_2886 && git checkout pr_2886
• helm install agones ./install/helm/agones --namespace agones-system --agones.image.release=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.29.0-c02de7e-amd64

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: roberthbailey, zmerlynn

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