Provide a Terse Notification format for Teams and Slack Notifications.

Currently, the amount of information in Teams and Slack notifications is satisfactory, however the presentation in the chat app is very dense and can take some time to grok when you're browsing the history of these messages either scanning the jobs that have run over the past few hours in your channel, or just trying to understand what just happened from the push notification that went to your phone.

Ideally, the first sentence is terse and is separated by white space from the remainder of the current paragraph format.

The MS Teams desktop app and push notifications on your phone for both Slack/Teams will truncate long messages. Making that first sentence critical in those mediums.

Some Examples
- UAT Deploy: Success. PR#123 from Branch 1
- PROD Deploy: Failed. PR#123 from Branch 1
- UAT Validate: Success. PR#123 from Branch 1
- PROD Validate: Success. PR#123 from Branch 1

I consider adding "..to Branch 2" as redundant in a terse format because it will always be the same based on the Environment/CI Job.