Set externalTrafficPolicy as Local for agones-allocator

[osterante]

What type of PR is this?
/kind feature

What this PR does / Why we need it:

Which issue(s) this PR fixes:

Closes #4019

Special notes for your reviewer:

[google-cla]

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[github-actions]

This PR exceeds the recommended size of 1000 lines. Please make sure you are NOT addressing multiple issues with one PR. Note this PR might be rejected due to its size.

[agones-bot]

Build Failed 😭

Build Id: 31736da0-7429-405f-850f-30d51f1ee005

Status: FAILURE

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[agones-bot]

Build Succeeded 🥳

Build Id: 0e9547eb-b205-4ee0-8aec-f206cc6c796e

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:1.45.0-dev-5784ef8
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.45.0-dev-5784ef8
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.45.0-dev-5784ef8-linux
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.45.0-dev-5784ef8
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.45.0-dev-5784ef8
• Linux C++ SDK (build): agonessdk-1.45.0-dev-5784ef8-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.45.0-dev-5784ef8.zip

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

• https://5784ef8-dot-preview-dot-agones-images.appspot.com/

To install this version:

git fetch https://github.com/googleforgames/agones.git pull/4022/head:pr_4022 && git checkout pr_4022
helm install agones ./install/helm/agones --namespace agones-system --set agones.image.registry=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.45.0-dev-5784ef8

[agones-bot]

Build Succeeded 🥳

Build Id: 8e767158-7ada-420a-9399-886636531b1a

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:1.45.0-dev-a4cda57
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.45.0-dev-a4cda57
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.45.0-dev-a4cda57-linux
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.45.0-dev-a4cda57
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.45.0-dev-a4cda57
• Linux C++ SDK (build): agonessdk-1.45.0-dev-a4cda57-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.45.0-dev-a4cda57.zip

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

• https://a4cda57-dot-preview-dot-agones-images.appspot.com/

To install this version:

git fetch https://github.com/googleforgames/agones.git pull/4022/head:pr_4022 && git checkout pr_4022
helm install agones ./install/helm/agones --namespace agones-system --set agones.image.registry=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.45.0-dev-a4cda57

[gongmax]

Discussed in the issue and thanks for the patience. Can you keep the default value unchanged for backward compatibility? And add a description for it here? It will need to be in a {{% feature publishVersion="1.46.0" %}} block similar as this, since we are release 1.45 today.

[gongmax]

/gcbrun

[agones-bot]

Build Succeeded 🥳

Build Id: cc659d3c-9577-4b35-905f-36d625696547

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-7bee786
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.46.0-dev-7bee786
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.46.0-dev-7bee786-linux
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.46.0-dev-7bee786
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.46.0-dev-7bee786
• Linux C++ SDK (build): agonessdk-1.46.0-dev-7bee786-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.46.0-dev-7bee786.zip

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

• https://7bee786-dot-preview-dot-agones-images.appspot.com/

To install this version:

git fetch https://github.com/googleforgames/agones.git pull/4022/head:pr_4022 && git checkout pr_4022
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-7bee786