Implementation of Jinja templated webhook alerts

[flefebure]

In my organization, we've been using Elementary for some time now. We're happy with it, but we didn't have a valid option for sending alerts on failures. We do have MS Teams, but the webhook connector is limited. So I modified elementary so that it could rely on a third-party api to send alerts. I also noticed that Teams webhook connectors were deprecated and on the verge of disappearing, so I figured I didn't have to do much to make my development work with the solution recommended by Microsoft (webhook in Power Automate) and that the community would be interested. So here's my code, which implements what I think is a fairly versatile way of broadcasting alerts. A good starting point is the file md docs/oss/guides/alerts/send-webhook-alerts.mdx Also, it wouldn't take much to send alerts via SMTP. Waiting for your comments.