CI badge shows "failed" for cancelled builds

[stephencelis]

Describe the bug

If the most recent job for a runner was cancelled, the badge takes this as a "failed" job, but this doesn't really make sense. Jobs are often cancelled when multiple in-flight branches are merged. It would make more sense for the badge to always reflect the most recent, completed, non-cancelled job.

A big red "failed" at the top of a project's README can scare newcomers away from considering the project, so these temporary states could be harmful for adoption.

To Reproduce

1. Have a repo with CI that auto-cancels jobs to prioritize the latest merge, and has a badge on the README.
2. Open a couple PRs on the repo
3. Merge one to start a job on main
4. Merge another to cancel that job
5. Observe the "failed" badge in the README as the second job is processed

Expected behavior

I expect canceled jobs to not be taken into account in the CI status.