Added GKE Workload Identity flag to GKE Terraform modules

[abmarcum]

This adds a workload_id flag for both the gke & gke-autopilot Terraform modules. If the option is set to true, this will enable the Workload Identity GKE feature through the associated Terraform GKE option.

By default, this option is set to false and Workload Identity will not be enabled on the GKE cluster.

This option is being added so that Allocation Endpoints can be run on GKE clusters provisioned by the Agones Terraform GKE modules.

[zmerlynn]

Thanks for the contribution!

[zmerlynn]

Thanks again!

[google-oss-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: abmarcum, zmerlynn
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[agones-bot]

Build Succeeded 👏

Build Id: 981be633-1ea4-43f1-a2e0-1da1b9da5f7a

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:1.30.0-d8497ac-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.30.0-d8497ac-linux-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.30.0-d8497ac-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.30.0-d8497ac-amd64
• Linux C++ SDK (build): agonessdk-1.30.0-d8497ac-amd64-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.30.0-d8497ac-amd64.zip

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

• https://d8497ac-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/2928/head:pr_2928 && git checkout pr_2928
• helm install agones ./install/helm/agones --namespace agones-system --agones.image.release=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.30.0-d8497ac-amd64

[agones-bot]

Build Succeeded 👏

Build Id: 1b2979d3-de9d-4437-9175-481c8f6c48e7

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:1.30.0-439b9bc-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.30.0-439b9bc-linux-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.30.0-439b9bc-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.30.0-439b9bc-amd64
• Linux C++ SDK (build): agonessdk-1.30.0-439b9bc-amd64-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.30.0-439b9bc-amd64.zip

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

• https://439b9bc-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/2928/head:pr_2928 && git checkout pr_2928
• helm install agones ./install/helm/agones --namespace agones-system --agones.image.release=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.30.0-439b9bc-amd64

[agones-bot]

Build Succeeded 👏

Build Id: f6ae6387-e77d-4ccc-9895-6140a4607679

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:1.30.0-3499989-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.30.0-3499989-linux-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.30.0-3499989-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.30.0-3499989-amd64
• Linux C++ SDK (build): agonessdk-1.30.0-3499989-amd64-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.30.0-3499989-amd64.zip

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

• https://3499989-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/2928/head:pr_2928 && git checkout pr_2928
• helm install agones ./install/helm/agones --namespace agones-system --agones.image.release=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.30.0-3499989-amd64

[google-oss-prow]

New changes are detected. LGTM label has been removed.

[agones-bot]

Build Succeeded 👏

Build Id: 1e40fd9c-8563-4a97-a3ef-4aabbf80c4df

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:1.30.0-b9583ab-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.30.0-b9583ab-linux-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.30.0-b9583ab-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.30.0-b9583ab-amd64
• Linux C++ SDK (build): agonessdk-1.30.0-b9583ab-amd64-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.30.0-b9583ab-amd64.zip

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

• https://b9583ab-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/2928/head:pr_2928 && git checkout pr_2928
• helm install agones ./install/helm/agones --namespace agones-system --agones.image.release=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.30.0-b9583ab-amd64