Adds script to generate alerts for failing jobs (#102002)
Copies over bits of the script from test-infra to grab the relevant parts an alert and turns them into a json. Generally copied over from check_alerts in pytorch/test-infra
<!--
copilot:poem
-->
### <samp>🤖 Generated by Copilot at 1789c36</samp>
> _`Python 3` shebang_
> _added for compatibility_
> _a good practice / spring_
Pull Request resolved: https://github.com/pytorch/pytorch/pull/102002
Approved by: https://github.com/huydhn, https://github.com/ZainRizvi
