Add debug logging to TestGameServerTcpProtocol for flaky test diagnosis

[markmandel]

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:

What it says on the tin. Why does this fail on autopilot every so often?

Which issue(s) this PR fixes:

N/A

Special notes for your reviewer:

N/A

[markmandel]

Of course this passes now that I have extra debugging on it

[agones-bot]

Build Succeeded 🥳

Build Id: f60a22d0-455a-4f17-a1f2-1b3422e9147a

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:1.58.0-dev-33f3379
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.58.0-dev-33f3379
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.58.0-dev-33f3379-linux
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.58.0-dev-33f3379
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.58.0-dev-33f3379
• image: us-docker.pkg.dev/agones-images/ci/agones-processor:1.58.0-dev-33f3379
• Linux C++ SDK (build): agonessdk-1.58.0-dev-33f3379-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.58.0-dev-33f3379.zip

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

• https://33f3379-dot-preview-dot-agones-images.appspot.com/

To install this version:

git fetch https://github.com/googleforgames/agones.git pull/4539/head:pr_4539 && git checkout pr_4539
helm install agones ./install/helm/agones --namespace agones-system --set agones.image.registry=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.58.0-dev-33f3379

[agones-bot]

Build Failed 😭

Build Id: 5fb1a538-31e2-41f3-8293-5f169a8958ca

Status: FAILURE

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