I observed that 100% of canceled jobs in my runner pool were not causing scale down events. This PR fixes that.
The problem was caused by #2119.
#2119 ignores certain webhook events in order to fix#2118. However, #2119 overdoes it and filters out valid job cancellation events. This PR uses stricter filtering and add visibility for future troubleshooting.
<details><summary>Example cancellation event</summary>
This is the redacted top portion of a valid cancellation event my runner pool received and ignored.
```json
{
"action": "completed",
"workflow_job": {
"id": 12848997134,
"run_id": 4738060033,
"workflow_name": "slack-notifier",
"head_branch": "auto-update/slack-notifier-0.5.1",
"run_url": "https://api.github.com/repos/nuru/<redacted>/actions/runs/4738060033",
"run_attempt": 1,
"node_id": "CR_kwDOB8Xtbc8AAAAC_dwjDg",
"head_sha": "55bada8f3d0d3e12a510a1bf34d0c3e169b65f89",
"url": "https://api.github.com/repos/nuru/<redacted>/actions/jobs/12848997134",
"html_url": "https://github.com/nuru/<redacted>/actions/runs/4738060033/jobs/8411515430",
"status": "completed",
"conclusion": "cancelled",
"created_at": "2023-04-19T00:03:12Z",
"started_at": "2023-04-19T00:03:42Z",
"completed_at": "2023-04-19T00:03:42Z",
"name": "build (arm64)",
"steps": [
],
"check_run_url": "https://api.github.com/repos/nuru/<redacted>/check-runs/12848997134",
"labels": [
"self-hosted",
"arm64"
],
"runner_id": 0,
"runner_name": "",
"runner_group_id": 0,
"runner_group_name": ""
},
```
</details>
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