Add ai_claude_* audit event types

Hitesh Raghuvanshirequested to merge
623167-ai-claude-audit-event-types into master

What does this MR do and why?

Adds 7 new audit event types for Claude Code session transcripts, distinguishing them from existing Duo agent events. This lets SIEMs and audit log readers identify the source by event name alone, without joining to internal Workflow database rows.

References

https://gitlab.com/gitlab-org/gitlab/-/work_items/623167

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Edited by Hitesh Raghuvanshi

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