Refactor rolling update test to support >1 inactive GameServerSets

[ivotimev]

What type of PR is this?
/kind bug

What this PR does / Why we need it:
This PR refactors the Rolling Update Deployment table tests to support >1 inactive game server sets.
It also adds a test that replicates Issue 2574: Presence of >2 GSS can cause a rolling update to become stuck until an allocation ends and highlights the issue.

Special notes for your reviewer:
The idea of this PR is to minimally reproduce Issue 2574.

[google-oss-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: ivotimev
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[agones-bot]

Build Failed 😱

Build Id: e4d5149a-5206-4354-a082-ec6f306cc7ce

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[agones-bot]

Build Succeeded 👏

Build Id: 68fb617d-e684-4c83-9868-08f4a2fbdb32

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

• image: gcr.io/agones-images/agones-controller:1.23.0-81da719-amd64
• image: gcr.io/agones-images/agones-ping:1.23.0-81da719
• Linux C++ SDK (build): agonessdk-1.23.0-81da719-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.23.0-81da719.zip

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

• https://81da719-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/2575/head:pr_2575 && git checkout pr_2575
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.23.0-81da719-amd64

[agones-bot]

Build Succeeded 👏

Build Id: c7841f91-5a94-45c9-bc3d-0f41fd18fef6

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

• image: gcr.io/agones-images/agones-controller:1.24.0-c3ce7ee-amd64
• image: gcr.io/agones-images/agones-ping:1.24.0-c3ce7ee
• Linux C++ SDK (build): agonessdk-1.24.0-c3ce7ee-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.24.0-c3ce7ee.zip

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

• https://c3ce7ee-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/2575/head:pr_2575 && git checkout pr_2575
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.24.0-c3ce7ee-amd64

[markmandel]

Just having a quick look at this - was this e2e test meant to fail?

[markmandel]

Gently bumping this - wanted to get more context on unit test?

[markmandel]

This has been sitting for a while now. I'm going to close it, but please feel free to revisit at a later date.