Fix registry update for different post types

[kuuak]

If we do not have the same registered blocks per post types the registry will be updated without all the available blocks.

Here a basic example:

If I have 3 available blocks core/heading, core/paragraph and custom/section.
Let's assume I do not need the custom/section in the Post post-type, therefore I have some custom code to checks if the current post type in the editor is post, and if so I unregister the custom/section block.

This means that when the registerBlockRegistryUpdate plugin run, it retrieves the available blocks, in this situation two blocks, and make the block registry to be updated with these 2 blocks.

But now I if I open the editor to edit a page, my custom code does not unregister the section block, and the registerBlockRegistryUpdate updates the registry with 3 blocks.

This is really a basic example where I have 1 missing block in the registry if the last content update was a Post.

But in my real usage I have more than 100 available blocks that can be available for one or many post types. I end up with sometimes 22 blocks in the registry, or 50 or more than a 100 when I manually hit the "Update block registry" button in the setting page.

My quick fix is then to I disabled the two editor plugins which updated the block registry with the current post type registered blocks.