UI: Include global output parameters in Outputs tab

[jonasdebeukelaer]

Summary

I'm currently able to define a global output parameter in my spec, which I can either access using argo get my-workflow, programmatically, or looking at the yaml definition in the UI. I'd like to extent the Output Artefacts tab to also include any output parameters, for convenient visibility in the UI.

Motivation

For explainability reasons, I would like to output a few global parameters once a workflow is completed. Ideally users of the platform in our company could more easily access this information by simply going to the Outputs (currently Output Artefacts) tab, instead of sifting through yaml to find them.

Proposal

Split the Output tab into two sections: Artefacts and Global Parameters, and list out the parameters there.

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