Display latest build status per workflow as the icon in the workflow list

**Is your feature request related to a problem? Please describe.**
Builds do fail sometimes. That is part of the nature of a CI system. I want to notice a failed build as quickly as possible

**Describe the solution you'd like**
The extension has a "Workflows" list. It correctly lists all the workflows. But I have to click on each of the workflows to open the list with the build result history. Most of the time, I am only interested in the status of the latest run.
The green check mark or red x icon should be displayed left to each workflow name depending on the outcome of the latest run for that workflow.

**Additional context**
I just installed the extension the first time. I like to see my build status in VSCode to be able to quickly act when a build fails (which might block the progress of a whole team in some cases).