Integrate CI emails into notification system
What does this MR do?
Integrate pipeline emails into the notification system. See #21930 (closed)
Screenshots (if relevant)
Does this MR meet the acceptance criteria?
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CHANGELOG entry added -
Documentation created/updated -
API support added -
Remove pushers from pipeline emails service (because that's already covered by notifications) - Tests
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With notification setting -
Pipeline transited to success or failed
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What are the relevant issue numbers?
Closes #21930 (closed)