Re-fill `product_categories` for metrics with existing information

Problem

In Remove product_category from metrics yml (#393366 - closed) we removed product_category from defintion files. In hindsight we see this as a wrong move and are reintroducing the field in Add `product_categories` to metric and event de... (#473400 - closed). Many metrics which were stripped off a product_category in #393366 (closed) are likely still belonging to the same category.

Desired Outcome

Re-introduce the lost data from #393366 (closed) but making sure that the product_categories used are still valid.

Potential Solution

TBD

How to verify

Further actions needed