Value stream analytics - Additional events

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• Close this issue

Extension of https://gitlab.com/gitlab-org/gitlab-ee/issues/10665 for configuring additional events beyond labels:

• Issue closed event.
• Issue opened event.
• Merge request linked to issue event.
• Pipeline kicked off.
• First-class workflow stages/events.

Additionally, there could be even more events beyond issue-centric events, such as merge request events.