Feature Request: Notification on deployment approval request

[toricls]

As a copilot user, I want to have an option to configure pipelines to send notifications when an approval action is ready for review. (see the original request here)

• In the current Copilot pipeline there is no option to configure them
• As a workaround we can manually configure a notification rule. But this could cause some configuration drift, and is not ideal.

[gautam-nutalapati]

This would be an amazing feature to have. I propose we extend this feature to sending all pipeline events (configurable in pipeline manifest):

• build success/failures (from buildspec)
• approval, deployment, test action success/failure events

Probably drop them all to a single SNS topic from where users can poll specific events as needed.