Move apiregistration & admissionregistration to v1

[markmandel]

What type of PR is this?

Uncomment only one /kind <> line, hit 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

What this PR does / Why we need it:

This moves our APIService, ValidatingWebhookConfiguration and MutatingWebhookConfiguration from v1betav1 to v1

Which issue(s) this PR fixes:

Work on #1799
Closes #1891

Special notes for your reviewer:

This includes moving the Go library references as well.

[agones-bot]

Build Succeeded 👏

Build Id: 4a688a8c-2fd4-4e34-9dbe-ce13f4945376

The following development artifacts have been built, and will exist for the next 30 days:

• image: gcr.io/agones-images/agones-controller:1.11.0-b2b326f
• image: gcr.io/agones-images/agones-sdk:1.11.0-b2b326f
• image: gcr.io/agones-images/agones-ping:1.11.0-b2b326f
• Linux C++ SDK (build): agonessdk-1.11.0-b2b326f-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.11.0-b2b326f.zip

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

• https://b2b326f-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/1918/head:pr_1918 && git checkout pr_1918
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.11.0-b2b326f

[agones-bot]

Build Succeeded 👏

Build Id: ffac93bb-97ff-471b-9b20-d510c949e93c

The following development artifacts have been built, and will exist for the next 30 days:

• image: gcr.io/agones-images/agones-controller:1.11.0-18f9968
• image: gcr.io/agones-images/agones-sdk:1.11.0-18f9968
• image: gcr.io/agones-images/agones-ping:1.11.0-18f9968
• Linux C++ SDK (build): agonessdk-1.11.0-18f9968-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.11.0-18f9968.zip

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

• https://18f9968-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/1918/head:pr_1918 && git checkout pr_1918
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.11.0-18f9968

[google-oss-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [markmandel,roberthbailey]

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Approvers can cancel approval by writing /approve cancel in a comment

[google-oss-robot]

New changes are detected. LGTM label has been removed.

[agones-bot]

Build Succeeded 👏

Build Id: e6a60418-eed6-4386-9f4e-f8b6d0df8898

The following development artifacts have been built, and will exist for the next 30 days:

• image: gcr.io/agones-images/agones-controller:1.11.0-d7c50e7
• image: gcr.io/agones-images/agones-sdk:1.11.0-d7c50e7
• image: gcr.io/agones-images/agones-ping:1.11.0-d7c50e7
• Linux C++ SDK (build): agonessdk-1.11.0-d7c50e7-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.11.0-d7c50e7.zip

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

• https://d7c50e7-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/1918/head:pr_1918 && git checkout pr_1918
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.11.0-d7c50e7