when running for a PR, improve in-issue reporting

* when triggering for a PR, add a nonce as metadata to every pixel eagle run
* once done, call api `https://pixel-eagle.com/B25A040A-A980-4602-B90C-D480AB84076D/runs\?filter=nonce={nonce}`
* for every run, there will be an entry of the form
```json
{
"project_id": "b25a040a-a980-4602-b90c-d480ab84076d",
"id": 7563,
"timestamp": 1737953544,
"metadata": {
"os": "macOS",
"branch": "PR-17413",
"gitref": "6911ddfd4b2d0f9efa6adba1605736112f7ef4f4"
"nonce": "{nonce}",
},
"screenshot_count": 266,
"compared_with": {
"id": 7560,
"changed": 8,
"missing": 0
}
}
```
* the counts in `compared_with` are done with a 0% tolerance and may not be the actual ones
* to get the actual result, call `https://pixel-eagle.com/B25A040A-A980-4602-B90C-D480AB84076D/runs/{id}/compare/{compared_with.id}`

- [ ] add nonce
- [ ] call the list run API and report for every run
- [ ] if there are diffs, check the actual results of the run