Reduce "Full Details" view in notifications

[carterm]

Time to reduce the amount on information added to slack on each post.

Let's keep...

• Everything in body (The payload from WordPress - trigger, slug, etc.)
• headers.user-agent (identifies the service sending the notification "WordPress/5.8.1; https://live-drought-ca-gov.pantheonsite.io")
• headers.host (Shows us the notification recipient - "fa-go-wordpress-to-github-drought-ca-gov.azurewebsites.net")

[carterm]

Bonus points to show the url and replace the "code=" with "code=[secret]".

[carterm]

Redacting the code= was the main concern. All the request info may be useful in the future