Enable counter based autoscaler to scale from 0 replicas

[geopaulm]

What type of PR is this?

Uncomment only one /kind <> line, press enter to put that in a new line, and remove leading whitespace from that line:

/kind breaking
/kind bug
/kind cleanup
/kind documentation
/kind feature
/kind hotfix
/kind release

What this PR does / Why we need it:
Enables counter based autoscaler to scale up correctly when there are 0 replicas.

Which issue(s) this PR fixes:

Closes #4047

Special notes for your reviewer:

[geopaulm]

/gcbrun

[igooch]

/gcbrun

[agones-bot]

Build Failed 😭

Build Id: 0a2611c9-157e-4061-b0ca-4bca505784f4

Status: FAILURE

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[igooch]

/gcbrun

[agones-bot]

Build Succeeded 🥳

Build Id: 71889521-823a-47e4-817c-e7f0e18d67aa

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:1.46.0-dev-c8d3c61
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.46.0-dev-c8d3c61
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.46.0-dev-c8d3c61-linux
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.46.0-dev-c8d3c61
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.46.0-dev-c8d3c61
• Linux C++ SDK (build): agonessdk-1.46.0-dev-c8d3c61-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.46.0-dev-c8d3c61.zip

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

• https://c8d3c61-dot-preview-dot-agones-images.appspot.com/

To install this version:

git fetch https://github.com/googleforgames/agones.git pull/4049/head:pr_4049 && git checkout pr_4049
helm install agones ./install/helm/agones --namespace agones-system --set agones.image.registry=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.46.0-dev-c8d3c61

[peterzhongyi]

LGTM

[peterzhongyi]

/gcbrun

[peterzhongyi]

Ran the tests locally, and verified the behaviors by manually incrementing and decrementing the counter on the simple game server to see it scaling up and down.

[igooch]

LGTM. Thanks!

[igooch]

/gcbrun

[agones-bot]

Build Succeeded 🥳

Build Id: 935d968a-3740-4430-8a54-e2938ebae2f1

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:1.46.0-dev-ad9167e
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.46.0-dev-ad9167e
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.46.0-dev-ad9167e-linux
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.46.0-dev-ad9167e
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.46.0-dev-ad9167e
• Linux C++ SDK (build): agonessdk-1.46.0-dev-ad9167e-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.46.0-dev-ad9167e.zip

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

• https://ad9167e-dot-preview-dot-agones-images.appspot.com/

To install this version:

git fetch https://github.com/googleforgames/agones.git pull/4049/head:pr_4049 && git checkout pr_4049
helm install agones ./install/helm/agones --namespace agones-system --set agones.image.registry=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.46.0-dev-ad9167e