Child Pipelines cause double Slack notifications on failure (or success)

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Summary

When you use Child Pipelines, when the child changes state (eg fails) then the parent changes state (fails) and both are sent as Slack messages.

GitLab version: Current SAAS version (Dec 3, 2020).

Steps to reproduce

• Configure Slack
• Create a child pipeline
• Cause it to fail
• See that two Slack messages arrive

Possible fixes

One way to fix it would be to have a checkbox config on the Slack integrations screen to "Not send notifications for child pipelines".