UI: Workflow of Workflows representation

[Asherslab]

Summary

Currently a workflow of workflows (using the resource template) creates a seperate workflow representation in the UI with no form of reference or link between the created workflow and the "parent" workflow. Having some way to see the entire workflow of workflows as a single UI visualization would be great.

Terms:
Parent referrers to any Workflow that creates a workflow
Child referrers to any Workflow created by a (parent) workflow

Ideas for implementation:

• Add a parent setting to the workflow spec, the parent setting can be filled in with a workflow name and a step name for what workflow created it. This is simpler than a children setting given that the parent when creating the child knows it's own name, however a child's name isn't always known by the parent due to generated names.
• When a workflow step has children display them in the UI Workflow view visualisation, timeline, etc.

Use Cases

This can be used for visualising and calculating complicated Workflow of Workflows scenarios where workflow templates aren't feasible, such as dynamically created workflows.

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[agilgur5]

Discussed this a bit over Slack yesterday and one (potentially simple) implementation option would be to have the resource step link to the new Workflow. This would be similar to how the Argo CD UI displays nested apps.

"Step links" could also potentially be made more generic and allow arbitrary links, also similar to Argo CD.
Workflows does already have custom links available for various pages/scopes (and custom columns on the List page), so I think this would be fairly consistent UX.

[agilgur5]

Linking was also suggested in #4238 (comment).

Workflows does already have custom links available for various pages/scopes

I am wondering if the Pod scope may actually cover this as a workaround. I haven't used that scope before, will need to check that