chore(github): run opened issues through ai (#68303)
## Why?
To help flag severe issues, we can use utilize AI to digest the
`context.payload.issue` object each time an issue is opened and
determine whether that issue is severe enough to flag to the Next.js
team on Slack.
## How?
Making a Tool Call using using the :ai-stonks: SDK. The :ai-stonks: will call the Tool and
report to Slack (to the `#next-info` channel`) if it determines that the
issue is severe enough, using the context of the issue, latest Next.js
versions, and a Triage Guideline.
## Testing
This was tested on a separate test repo with issues
https://github.com/vercel/next.js/issues/68328 (real issue) and
https://github.com/vercel/next.js/issues/68336 (blank test issue).
