Adds basic framework for the in place Agones upgrades test controller

[igooch]

What type of PR is this?

/kind feature

What this PR does / Why we need it:

This is the first piece of testing in place Agones upgrades.

• Adds a ConfigMap for mapping valid Agones versions and Feature Gates to Kubernetes versions
• Adds controller run by a Job that gets the version of Kubernetes that the Job Pod is running on, and gets the Agones and Feature Gates that are valid for that version of Kubernetes.
• Adds basic Make, Docker, go.mod and go.sum files for creating the controller container. Later this will be better integrated into the existing Build directory.

Which issue(s) this PR fixes:

Working on #3795

Special notes for your reviewer:

To run:

1. Have a running Kubernetes cluster with Agones installed
2. Have REGISTRY set to your artifact registry
3. The $(REGISTRY) value in upgradeTest.yaml currently needs to be manually set to your registry
4. make build && make push to your registry
5. kubectl apply -f permissions.yaml for reading Pod and Node
6. kubectl apply -f versionMap.yaml to load the configmap
7. kubectl apply -f upgradeTest.yaml to run the test runner
8. You should be able to see the valid configurations printed out in logs explorer with filter resource.labels.container_name="upgrade-test-controller"

[agones-bot]

Build Failed 😭

Build Id: 500a31c7-f163-4624-9bda-c827eaffd498

Status: FAILURE

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• Cloud Build log download

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[agones-bot]

Build Failed 😭

Build Id: 5471404c-60c9-4ae5-aa8a-c54cddfe4203

Status: FAILURE

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• Cloud Build log download

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[agones-bot]

Build Failed 😭

Build Id: 8c2a6f50-e4d8-485e-a742-b0fff36db20c

Status: FAILURE

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• Cloud Build log download

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[agones-bot]

Build Succeeded 🥳

Build Id: 6a2e0bce-c96c-4a46-aa49-3a5d42fe7d88

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:1.43.0-dev-dd57ce5
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.43.0-dev-dd57ce5
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.43.0-dev-dd57ce5-linux
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.43.0-dev-dd57ce5
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.43.0-dev-dd57ce5
• Linux C++ SDK (build): agonessdk-1.43.0-dev-dd57ce5-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.43.0-dev-dd57ce5.zip

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

• https://dd57ce5-dot-preview-dot-agones-images.appspot.com/

To install this version:

git fetch https://github.com/googleforgames/agones.git pull/3956/head:pr_3956 && git checkout pr_3956
helm install agones ./install/helm/agones --namespace agones-system --set agones.image.registry=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.43.0-dev-dd57ce5

[agones-bot]

Build Succeeded 🥳

Build Id: 2d631d70-4674-4e6e-a410-38768acc90be

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:1.43.0-dev-b765f49
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.43.0-dev-b765f49
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.43.0-dev-b765f49-linux
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.43.0-dev-b765f49
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.43.0-dev-b765f49
• Linux C++ SDK (build): agonessdk-1.43.0-dev-b765f49-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.43.0-dev-b765f49.zip

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

• https://b765f49-dot-preview-dot-agones-images.appspot.com/

To install this version:

git fetch https://github.com/googleforgames/agones.git pull/3956/head:pr_3956 && git checkout pr_3956
helm install agones ./install/helm/agones --namespace agones-system --set agones.image.registry=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.43.0-dev-b765f49