Don't display GitHub Actions in Jira if all jobs are skipped

GitHub Actions allows users to skip a job, using something like `if: github.ref == 'refs/heads/main'` in their `.yml` file.
If all jobs from a workflow are skipped, we shouldn't display the workflow as a build/deploy in Jira, since nothing ran.


Start by reproducing a workflow where every GitHub Actions job is skipped, then trace how the integration turns workflow results into Jira builds or deployments. Done means an all-skipped workflow creates no Jira build or deployment, while a workflow with a running job continues to appear.

Written by the indexing model from the issue text.