Add product category - import vol. 1

What does this MR do and why?

Related to gitlab-org/analytics-section/analytics-instrumentation/internal#784

Adds product categories to up to 50 metrics. These product_categories are generated automatically, using Duo.

Full script used for generating changes is available here.

This is an attempt to have better data coverage in metrics.

References

Screenshots or screen recordings

How to set up and validate locally

This MR changes needs to be verified manually - a person with domain knowledge has to go through the metrics and see if the assigned product_categories look correct. No local validation is needed, as the changes are only adding metadata not visible when using GDK.

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.