Fixes build error in push-upgrade-test

[igooch]

What type of PR is this?

/kind hotfix

What this PR does / Why we need it:

Fixes build error k8s.io/[email protected] requires go >= 1.23.0 (running go 1.22.9; GOTOOLCHAIN=local). Running go mod tidy as part of the Dockerfile build updated the go.mod file to use go version 1.23 even though the builder uses golang version 1.22, which causes a versioning conflict.

Fix hard codes Golang version (an explicit go.mod file) so that there is no conflict between the Docker builder golang version and the go.mod version. Also updates the test/upgrade golang version to be the same golang version as the rest of the Agones project.

Which issue(s) this PR fixes:

NA

Special notes for your reviewer:

I will create a second issue to upgrade Golang in general, since 1.23 has been out for a while we should upgrade.

[agones-bot]

Build Failed 😭

Build Id: 6ee97508-ba10-4e80-9549-cbc0f1ede586

Status: FAILURE

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[gongmax]

/gcbrun

[agones-bot]

Build Succeeded 🥳

Build Id: 617ccf3c-2ebd-4949-8777-f7a54d2e4929

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-bed5a31
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.46.0-dev-bed5a31
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.46.0-dev-bed5a31-linux
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.46.0-dev-bed5a31
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.46.0-dev-bed5a31
• Linux C++ SDK (build): agonessdk-1.46.0-dev-bed5a31-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.46.0-dev-bed5a31.zip

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

• https://bed5a31-dot-preview-dot-agones-images.appspot.com/

To install this version:

git fetch https://github.com/googleforgames/agones.git pull/4065/head:pr_4065 && git checkout pr_4065
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-bed5a31