Fixes TestGameServerResourceValidation flake

[igooch]

What type of PR is this?

/kind bug

What this PR does / Why we need it:

Fixes TestGameServerResourceValidation flaky test by sorting the returned errors for a deterministic result.

Which issue(s) this PR fixes:

Closes #3362

Special notes for your reviewer:

[markmandel]

Emphatic approval!

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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

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]

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

[agones-bot]

Build Succeeded 👏

Build Id: 73a25f7a-8572-4bda-bcde-044ea09a1093

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:1.35.0-dev-f0310c7-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.35.0-dev-f0310c7-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.35.0-dev-f0310c7-linux-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.35.0-dev-f0310c7-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.35.0-dev-f0310c7-amd64
• Linux C++ SDK (build): agonessdk-1.35.0-dev-f0310c7-amd64-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.35.0-dev-f0310c7-amd64.zip

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

• https://f0310c7-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/3373/head:pr_3373 && git checkout pr_3373
• helm install agones ./install/helm/agones --namespace agones-system --set agones.image.registry=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.35.0-dev-f0310c7-amd64