Feature tracking guidance for PMs

Description

This merge request adds a new section to the handbook titled "Guidance for Instrumenting Feature Tracking." It provides a comprehensive guide for Product Managers on how to implement and track metrics for their features. The new content includes quick links to relevant resources, information about self-service feature tracking dashboards, and a step-by-step process for instrumenting feature tracking. It also covers special considerations for AI Gateway features and lists key contacts and resources. This addition aims to streamline the process of feature tracking and ensure consistent data collection across GitLab's product teams.

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Commits

• Feature tracking guidance

---

content/handbook/enterprise-data/programs/data-for-product-managers/index.md

@@ -95,7 +95,7 @@ If your analytics needs for your new or recently modified feature are met by the
    **Owner: Product Manager**
    - Use the [Usage Data Instrumentation Issue Template](https://gitlab.com/gitlab-org/gitlab/-/issues/new?issuable_template=Usage%2520Data%2520Instrumentation)
    - Ensure proposed event properties align with analytics requirements
-   - Tag your [assigned product analyst](https://handbook.gitlab.com/handbook/product/groups/product-analysis/#team-members) for review
+   - Tag your [assigned product analyst](/handbook/product/groups/product-analysis/#team-members) for review
 
 1. Implement Tracking
    **Owner: Engineer**