require.NoError in fleet tests instead of continuing

[zmerlynn]

When the fleet tests flake, they take out the rest of the test suite:

Step #24 - "submit-e2e-test-cloud-build": gke-autopilot-1.24: Step #2 - "e2e-stable": VERBOSE: --- FAIL: TestFleetScaleUpAllocateEditAndScaleDownToZero (163.39s)
Step #24 - "submit-e2e-test-cloud-build": gke-autopilot-1.24: Step #2 - "e2e-stable": VERBOSE: panic: runtime error: index out of range [0] with length 0 [recovered]
Step #24 - "submit-e2e-test-cloud-build": gke-autopilot-1.24: Step #2 - "e2e-stable": VERBOSE:     panic: runtime error: index out of range [0] with length 0

[google-oss-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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

Build Failed 😱

Build Id: 5d8cd35e-9ce3-4ea0-89bc-d0a41869054b

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[google-oss-prow]

New changes are detected. LGTM label has been removed.

[agones-bot]

Build Succeeded 👏

Build Id: 36320fa6-5385-4535-99de-9a438ef5a4a6

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:1.32.0-0ebd4f5-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.32.0-0ebd4f5-linux-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.32.0-0ebd4f5-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.32.0-0ebd4f5-amd64
• Linux C++ SDK (build): agonessdk-1.32.0-0ebd4f5-amd64-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.32.0-0ebd4f5-amd64.zip

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

• https://0ebd4f5-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/3124/head:pr_3124 && git checkout pr_3124
• helm install agones ./install/helm/agones --namespace agones-system --agones.image.release=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.32.0-0ebd4f5-amd64