Store Editing Templates: Migrate incorrect plugin slug in the database.

[tjcafferkey]

Description

Please read the original issue about the incorrect plugin slug here #5423

We were able to fix this by updating the usages to use the correct plugin slug (#5519) (woocommerce/woocommerce) and querying the DB for both the incorrect and correct slugs used. For sites that have already customised DB templates whilst using the old slug they will have this saved in their DB. We need to migrate these values to the new slug.

What we need to consider

If the site has DB entries using the old slug and the new slug:
We will have to find the term_id for the old slug and update all entries using it to use the new slugs term_id.

If the site has DB entries just using the old slug:
We can simply update the old slug row in wp_terms

From:
name: WooCommerce
slug: woocommerce

To:
name:woocommerce/woocommerce
slug: woocommerce-woocommerce

[frontdevde]

Closing this issue as we decided against a DB migration (see slack-archives/C8X6Q7XQU/p1642065460228900).