Remove Reusable Block Support

Problem/Motivation

Reusable block support in Patternkit does not work as intended, and in most cases, does not result in the ability to reuse a configured block in multiple places with configuration in only one location. Due to this, support for reusable blocks as it currently exists will be removed from Patternkit until it can be re-evaluated and potentially re-implemented.

This will involve a migration process to remove/replace any existing blocks that needs to be explored and implemented for any current users.

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes