CLI generator: Add code examples for AI tracking instrumentation

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Overview

This issue implements the next iteration of AI usage tracking support in the CLI generator, as outlined in #568763 (closed).

Tasks

• Add code examples for registering event with AI tracking in Gitlab::Tracking::AiTracking
  • Include examples with metadata
  • Include examples without metadata
  • Reference: https://docs.gitlab.com/development/ai_features/usage_tracking/#adding-new-event-for-tracking
• Add event code examples for triggering event using InternalEvents.track_event
• Add AI code examples for rspec

Related Issues

• Relates to #568763 (closed) (CLI generator should support instrumentation for AI usage tracking events and metrics)

Acceptance Criteria

• CLI generator provides code examples for Gitlab::Tracking::AiTracking registration (with and without metadata)
• CLI generator provides code examples for triggering events with InternalEvents.track_event
• CLI generator provides rspec test examples for AI tracking
• All examples follow GitLab's AI tracking best practices documentation