feat(Backend + SDK): Update kfp backend and kubernetes sdk to support node affinity

[cjidboon94]

Description of your changes: This PR adds support for node affinity to the driver and kubernetes_platform SDK.

It is a follow up to #10671 and #10583, which updated the protobuf and Golang stub.

It follows the excellent example set by https://github.com/kubeflow/pipelines/pull/10427.

Huge thanks to @Tomcli for paving the way and sharing how to validate things end to end. Part of https://github.com/kubeflow/pipelines/issues/9768 and https://github.com/kubeflow/pipelines/issues/9682

Pod (Anti)Affinity will be added in a separate PR

Checklist:

• [x] The title for your pull request (PR) should follow our title convention. Learn more about the pull request title convention used in this repository.

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[rimolive]

Hi @cjidboon94! With #10671 already merged, do you think we can unhold this PR?

[cjidboon94]

Hi @cjidboon94! With #10671 already merged, do you think we can unhold this PR?

@rimolive For sure!

[rimolive]

/unhold

[rimolive]

cc @chensun

As the PR author said it's ready to review, can you remove the WIP tag?

[cjidboon94]

@rimolive Oh, it's not ready yet for review. Sorry, misunderstood what you meant by unhold. What I meant was that I'm going to finish this PR and then will switch it to "Ready for review"

[rimolive]

Hi @cjidboon94, do you have an ETA when you plan to finish the PR? Just to say that @droctothorpe is willing to help.

[droctothorpe]

Happy to help. This PR may be a helpful reference.

[cjidboon94]

@droctothorpe Thanks for making some time! Maybe you can get ahead on the podAffinity and podAntiAffinity as this PR will only focus on nodeAffinity. While pod(anti)Affinity does fall under Affinity, I think they're separate enough that you could already work on it. I expect that we might need to merge some things or have a plan on which PR to merge first.

@rimolive I believe what's left is:

• [x] backend tests
• [ ] python sdk implementation
• [ ] python sdk tests

I hope to finish up this week, had some life things going on that kept me off track but those are resolved now.

[google-oss-prow[bot]]

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[cjidboon94]

Still requires some work, I think (several more python tests to show different cases), but open to feedback/reviews

[therc]

Any way we can help with this (and pod affinity)? The changes look OK from here.