Argo Rollouts UI integration for promotions where rollouts are used

[blakestoddard]

Proposed Feature

Using Kargo with Argo/Rollouts requires looking in two different places for info -- Kargo for starting a promotion (and info on the deployment status), and Argo for information on where the deployment actually stands. If you use the argocd-update step, a direct link to Argo will be provided in a cell on the Promotions table (though it has a habit of disappearing while there is a promotion in-progress). If you use Argo Rollouts, you must know to click the ArgoCD link, find the Rollout object, and then select the Rollouts tab.

My users want to be able to promote a piece of freight and watch it flow through the steps outlined in a promotion template AND also also see the canary/rollout status directly from Kargo without opening another tab. There's already some prior art for this in the form of the Analysis Templates UI.