Provide custom content block create/edit permissions

Digging into this, I see that we are checking for 'create and edit custom blocks' as a permission to show the form.
This permission is provided by layout_builder which may not necessarily be installed (In my case is wasn't).

This module should either provided its own permission 'gutenberg create and edit custom block_content' ?
or possibly check the $block->access('update') on the individual block.

loze → closed merge request !149

loze → reopened merge request !149

loze → closed merge request !149

loze → reopened merge request !149

My MR does the following:

• adds the permission 'create and edit custom gutenberg content blocks' for all content block types in the editor so it does not need ot rely on the layout_builder permission
• Shows a warning message to the user if they do not have permission
• removes the submit button on the form if they do not have permission
• Gets rid of the error messages if they submit the node with no contentBlockId

This is awesome! Thank you @loze.

Automatically closed - issue fixed for 2 weeks with no activity.