[Unreal SDK] Added a response code check to some functions

[dotcom]

What type of PR is this?
/kind bug

Which issue(s) this PR fixes:
Added a response code check to some functions about Unreal SDK.

[agones-bot]

Build Succeeded 👏

Build Id: 4f5068d7-ee3a-4272-ad07-c1c0fbc6f2ae

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

• image: gcr.io/agones-images/agones-controller:1.10.0-e1d33b9
• image: gcr.io/agones-images/agones-sdk:1.10.0-e1d33b9
• image: gcr.io/agones-images/agones-ping:1.10.0-e1d33b9
• Linux C++ SDK (build): agonessdk-1.10.0-e1d33b9-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.10.0-e1d33b9.zip

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

• https://e1d33b9-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/1870/head:pr_1870 && git checkout pr_1870
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.10.0-e1d33b9

[domgreen]

LGTM

Looks like a good addition 👍

[google-oss-robot]

@domgreen: changing LGTM is restricted to collaborators

In response to this:

LGTM

Looks like a good addition 👍

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[markmandel]

Only questions I have - is this a breaking change?

Other than that, I'm happy to push this through 👍

[dotcom]

@markmandel
No. The user interface has not changed. It can still be used. This makes it less confusing for the user.
Users can execute an Error callback in case of a bad response code in addition to communication errors.

[markmandel]

[google-oss-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: domgreen, dotcom, markmandel

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• OWNERS [markmandel]

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[google-oss-robot]

New changes are detected. LGTM label has been removed.

[agones-bot]

Build Succeeded 👏

Build Id: b2a5f4aa-c01b-43da-b11f-c0f96daf9f30

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

• image: gcr.io/agones-images/agones-controller:1.10.0-7ec735f
• image: gcr.io/agones-images/agones-sdk:1.10.0-7ec735f
• image: gcr.io/agones-images/agones-ping:1.10.0-7ec735f
• Linux C++ SDK (build): agonessdk-1.10.0-7ec735f-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.10.0-7ec735f.zip

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

• https://7ec735f-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/1870/head:pr_1870 && git checkout pr_1870
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.10.0-7ec735f