Show workflows across repos sorted by trigger date

**Is your feature request related to a problem? Please describe.**
I have a few repos that work together, common in micro services or backend / frontend / etc decoupling. I push often with continuous delivery. Right now you can only fit a single repo's workflows on screen in the workflows section at a time. There is no tool that simply shows all of your workflow builds in a master dashboard.

**Describe the solution you'd like**

- I would love to see a combined Workflows view that shows all builds for all repos in a single list, in the order that they were triggered.
- Optionally, some repo workflows trigger other workflows in another repo, and it would be great to have a visual representation of that, like an arrow from the triggering to the triggered or something.

**Additional context**

Note In this screenshot how I have four related repos but expanding one takes up the entire screen, e.g. you can't even see the third and fourth repo. Further there is no chronological workflow ordering across repos.

The issue identifies the existing Workflows section but names no files, tests, or entry points. Start by tracing how that view loads and displays one repository's workflows, then determine the scope of cross-repository data and ordering. Done means a combined view can show workflows from related repositories sorted by trigger date; the optional trigger relationship visualization needs separate scope.

索引モデルが issue の本文から書いたものです。