Flake: TestGameServerAllocationValidate

[markmandel]

What type of PR is this?

Uncomment only one /kind <> line, press 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
/kind release

What this PR does / Why we need it:

Moving the FeatureMutexLock so that it covers the top part of the test which can flake if feature flags are not set as expected.

Which issue(s) this PR fixes:

N/A

Special notes for your reviewer:

Flake: #3442 (comment)

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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

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Needs approval from an approver in each of these files:

• OWNERS [markmandel]

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[agones-bot]

Build Succeeded 👏

Build Id: 9daa500f-00b3-410d-ab95-9e3702e19741

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:1.36.0-dev-fd9be7e-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.36.0-dev-fd9be7e-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.36.0-dev-fd9be7e-linux-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.36.0-dev-fd9be7e-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.36.0-dev-fd9be7e-amd64
• Linux C++ SDK (build): agonessdk-1.36.0-dev-fd9be7e-amd64-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.36.0-dev-fd9be7e-amd64.zip

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

• https://fd9be7e-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/3443/head:pr_3443 && git checkout pr_3443
• helm install agones ./install/helm/agones --namespace agones-system --set agones.image.registry=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.36.0-dev-fd9be7e-amd64