Fix AI usage stats seeds
What does this MR do and why?
Fixes the error for the ai usage data seed:
NameError: uninitialized constant Gitlab::Tracking::AiTracking::EVENTS
(eval):46:in `block (2 levels) in create_ai_usage_data'
(eval):43:in `times'
(eval):43:in `block in create_ai_usage_data'
(eval):31:in `times'
(eval):31:in `create_ai_usage_data'
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