Prevent new occurrences of Gitlab::InternalEvents being used without an internal event definition

Jonas Larsenrequested to merge
461647-prevent-new-occurrences-of-gitlab-internalevents-being-used-without-an-internal-event into master

What does this MR do and why?

It raises an exception in dev and test if a Internal Events are called with an event name that is not defined in an event definition.

This is to prevent that we introduce new metrics without documenting the events.

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Related to #461647 (closed)

Edited by Jonas Larsen

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