Use job summary to improve build output

[ErikSchierboom]

Recently, GitHub released a new feature for workflows: job summaries.
The org-wide-files workflow that creates the PRs to the tracks is a perfect candidate for using this workflow I feel. It could output a table listing the repos and with a link to the created PR, as well as some additional metadata (whether or not the PR already existed, whether it is a track or tooling repo, etc.).

[ee7]

I was just about to create an issue for this.

It could be worth considering for the configlet workflow too, showing e.g.:

• number of lint errors/warnings
• number of exercises with everything synced/unsynced docs/metadata/tests
• number of unformatted exercises

[ErikSchierboom]

Absolutely, this would be perfect for the configlet workflow.