Remove unused target for generating change log

[gongmax]

What type of PR is this?

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/kind breaking
/kind bug

/kind cleanup

/kind documentation
/kind feature
/kind hotfix

What this PR does / Why we need it:

Which issue(s) this PR fixes:

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[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: gongmax, markmandel

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[agones-bot]

Build Succeeded 👏

Build Id: fd05a71b-e686-406b-ad0b-fd86a2c73cf0

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:1.32.0-43bce74-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.32.0-43bce74-linux-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.32.0-43bce74-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.32.0-43bce74-amd64
• Linux C++ SDK (build): agonessdk-1.32.0-43bce74-amd64-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.32.0-43bce74-amd64.zip

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

• https://43bce74-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/3126/head:pr_3126 && git checkout pr_3126
• helm install agones ./install/helm/agones --namespace agones-system --agones.image.release=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.32.0-43bce74-amd64