Feature Request: Select all categories when adding category to new category content type

[mattyarbrough]

This stems from a client request, https://dotcms.zendesk.com/agent/tickets/94752

We would like, when adding a new piece of content of the type Category, to be able to Select All in the category popup, but not the sub-categories.

[stale]

This issue has been automatically marked as stale because it has not had activity within the past 90 days. It will be closed in 30 days no further activity occurs. Thank you.