Adds Counters and Lists REST API Conformance Tests

[igooch]

What type of PR is this?

/kind feature

What this PR does / Why we need it:

• Adds Counters and Lists REST API Conformance Tests.
• Updates SDK server UpdateCounter to handle multiple changes in one request as the REST API can request to change the capacity, count, and countdiff all in one request. (The REST API client is generated directly from the alpha.proto and has the methods GetCounter, UpdateCounter, GetList, UpdateList, AddListValue and RemoveListValue which are different from the client methods in the Arbitrary Counts and Lists for GameServers, SDKs and Allocation #2716 that the Go SDK uses and other language SDKs will use.)
• Updates the SDK Server to follow the same updateCounter sequence as the local SDK server of first updating the setcapacity, then setcount, then countdiff.
• Fixes a bug in the local SDK server to properly update the setcount.
• Refactors Player Tracking REST API Conformance tests into a separate method to reduce cyclomatic complexity.

Which issue(s) this PR fixes:

Working on #2716

Special notes for your reviewer:

[agones-bot]

Build Succeeded 👏

Build Id: 221552aa-bb48-4434-a403-12d4598e8070

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-5171a59-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.37.0-dev-5171a59-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.37.0-dev-5171a59-linux-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.37.0-dev-5171a59-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.37.0-dev-5171a59-amd64
• Linux C++ SDK (build): agonessdk-1.37.0-dev-5171a59-amd64-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.37.0-dev-5171a59-amd64.zip

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

• https://5171a59-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/3546/head:pr_3546 && git checkout pr_3546
• 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-5171a59-amd64

[agones-bot]

Build Failed 😱

Build Id: 4093cbe4-4ce8-4245-a704-114f6ca49a04

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[agones-bot]

Build Succeeded 👏

Build Id: f8c60d1d-fed1-4f81-a576-c9ab2cb7227c

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-a710c98-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.37.0-dev-a710c98-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.37.0-dev-a710c98-linux-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.37.0-dev-a710c98-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.37.0-dev-a710c98-amd64
• Linux C++ SDK (build): agonessdk-1.37.0-dev-a710c98-amd64-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.37.0-dev-a710c98-amd64.zip

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

• https://a710c98-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/3546/head:pr_3546 && git checkout pr_3546
• 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-a710c98-amd64