[WIP] Workflow Run Form Enhancements

[ahmedhamidawan]

Fixes #18883

Brainstorming ideas, going by plan outlined in issue ^ as well as what would be most useful and straightforward for users.

Very draft, initial version screencast

simplified_wf_run.mp4

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[mvdbeek]

I don't think the split view is a good idea. This will never work for production-sized workflows and makes the whole submission harder to understand. If there is a side-panel control option (one that hides the activity bar and history) I would split that out as its own enhancement, and one that we'd probably want to be able to set via the landing request API as well.