Replace node_pool with google_container_node_pool

[junekhan]

What type of PR is this?
/kind bug

What this PR does / Why we need it:

Which issue(s) this PR fixes:

Closes #3339

Special notes for your reviewer:
I don't have a GCP account to verify this.

[agones-bot]

Build Succeeded 👏

Build Id: 1b772b2e-52e2-4785-b277-282012777a26

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:1.38.0-dev-450d8f5-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.38.0-dev-450d8f5-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.38.0-dev-450d8f5-linux-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.38.0-dev-450d8f5-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.38.0-dev-450d8f5-amd64
• Linux C++ SDK (build): agonessdk-1.38.0-dev-450d8f5-amd64-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.38.0-dev-450d8f5-amd64.zip

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

• https://450d8f5-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/3611/head:pr_3611 && git checkout pr_3611
• helm install agones ./install/helm/agones --namespace agones-system --set agones.image.registry=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.38.0-dev-450d8f5-amd64

[gongmax]

Can we also replay the "windows" node pool with google_container_node_pool?

[markmandel]

Thanks for your PR of my livestream content from yesterday.

I'm going to close this, as I have the PR ready to go, and I can test on Google Cloud 😃