Another List fleet autoscaler e2e test

[igooch]

What type of PR is this?

/kind feature

What this PR does / Why we need it:

Which issue(s) this PR fixes:

Working on #2716

Special notes for your reviewer:

[markmandel]

I like it! Approved

[agones-bot]

Build Failed 😱

Build Id: 2c876ed9-6078-4121-a8eb-9188e407d4d9

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[markmandel]

Looks like a legit panic we should solve:

--- FAIL: TestListAutoscalerWithSDKMethods (38.42s)
panic: runtime error: index out of range [2] with length 2 [recovered]
	panic: runtime error: index out of range [2] with length 2

goroutine 1169 [running]:
testing.tRunner.func1.2({0x28bea20, 0xc000043758})
	/usr/local/go/src/testing/testing.go:1526 +0x372
testing.tRunner.func1()
	/usr/local/go/src/testing/testing.go:1529 +0x650
panic({0x28bea20, 0xc000043758})
	/usr/local/go/src/runtime/panic.go:890 +0x263
agones.dev/agones/test/e2e.TestListAutoscalerWithSDKMethods.func1(0x0?)
	/go/src/agones.dev/agones/test/e2e/fleetautoscaler_test.go:1423 +0xba8
testing.tRunner(0xc0009081a0, 0xc00034e0a0)
	/usr/local/go/src/testing/testing.go:1576 +0x217
created by testing.(*T).Run
	/usr/local/go/src/testing/testing.go:1629 +0x806
FAIL test/e2e.TestListAutoscalerWithSDKMethods (38.42s)
FAIL test/e2e
=== RUN   TestSuperTuxKart

[igooch]

Looks like a legit panic we should solve

Yep, made the update to wait until the first autoscale (specifically downsize) is complete before grabbing the list of gameservers.

[agones-bot]

Build Failed 😱

Build Id: ae083b24-9318-437b-86d3-e378937d9a21

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[agones-bot]

Build Failed 😱

Build Id: 562a134c-70ea-42b0-9671-c4ae5302ecfc

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[agones-bot]

Build Succeeded 👏

Build Id: 21727569-1058-468b-92d4-9de2169a4ee3

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:1.37.0-dev-602c031-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.37.0-dev-602c031-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.37.0-dev-602c031-linux-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.37.0-dev-602c031-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.37.0-dev-602c031-amd64
• Linux C++ SDK (build): agonessdk-1.37.0-dev-602c031-amd64-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.37.0-dev-602c031-amd64.zip

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

• https://602c031-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/3521/head:pr_3521 && git checkout pr_3521
• helm install agones ./install/helm/agones --namespace agones-system --set agones.image.registry=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.37.0-dev-602c031-amd64

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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

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