[feature] Expose existing_token in KFP CLI

[tumido]

Feature Area

/area sdk

What feature would you like to see?

In Python SDK there's an kfp.Client's property called existing_token. This argument comes very handy in environments where KFP uses external auth providers etc. KFP CLI is unusable in these environments, since its users can't use --existing-token option there.

What is the use case or pain point?

Being unable to use KFP CLI simply because there's one missing option which exists in the underlying SDK is very unfortunate.

Is there a workaround currently?

Users have to use Python SDK's kfp.Client directly.

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[tumido]

Tbh, I'm not sure if this is even a feature request or a bug report. 🙂

Anyways, I think this is very simple to implement anyways.. here's a PR: #11400