Add compatibility code for renamed AI usage events

Pavel Shutsinrequested to merge
568027-usageevents-dumpwritebuffercronworker-throws-argumenterror-start_agent_platform_session-is-not-a-valid-event into master

What does this MR do and why?

Fixes a bug where old buffered event names are not properly processed for writing from buffer to PG. No user facing changes.

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Related to #568027 (closed)

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