Re-run a failed GitHub workflow only when it can help

**Objective:** Decide whether the latest failed run of `{workflow-name}` in `{repository}`, on branch `{branch}` when given, should be re-run, and re-run it only after the user confirms.

**Step 1: Check the workflow**

Call `github-get-workflow` with company `{repository}` and name `{workflow-name}`. If its status is not `active`, say it is disabled and stop; a re-run will not help.

**Step 2: Find the run**

Call `github-get-workflow-run` with company `{repository}`, name `{workflow-name}`, branch `{branch}` when given, and max-records 20. Find the most recent run with conclusion `failure`.

* If a newer run on the same branch already succeeded, say so and do not re-run.
* If a newer run is queued or in_progress, say so and do not re-run.
* If the same sha has already failed three or more times, say it is unlikely to be flaky and recommend fixing the code instead. Only continue if the user insists.

**Step 3: Confirm**

Show the run-number, branch, sha, commit-message and url, and ask the user to confirm the re-run.

**Step 4: Re-run**

Call `github-rerun-workflow-run` once, passing the run's workflow-run-id as run-id. Then call `github-get-workflow-run` with run-number set to it and report its new status.

**Rules & Guidelines:**

* Re-run one run at most. Never loop re-runs.
* Do NOT call `github-cancel-workflow-run`, `github-enable-workflow` or `github-disable-workflow`.

**Validation:**

* If no failed run is found, report the latest run's conclusion and stop.
* If `{workflow-name}` matches no workflow, call `github-get-workflow` with name.contains and list the close matches.