Problem Description: unify and update success headers

Proposed Solution: updating all success alerts to match modular model proposed in https://docs.google.com/document/d/1MnTmoB64sQQTReynWdiUhtduRY-4WxokY22sdxKwLIk/edit# and https://docs.google.com/document/d/1MnTmoB64sQQTReynWdiUhtduRY-4WxokY22sdxKwLIk/edit#

Reminder: Set the affected Component(s): [API, UI, Infrastructure, Importer, Installer, Sync, Docs, pulp_ansible, pulpcore]