Add deprecation status to AI usage events

Pavel Shutsinrequested to merge
556880-add-deprecation-status-for-ai-events into master

What does this MR do and why?

Add deprecation status to AI usage events DSL

Deprecation status can be set for events which we don't gather anymore but they still exist in DB for old data.

We already have couple events which can be marked as deprecated.

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Related to #556880 (closed)

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