Add more context to `mkdir(): Permission Denied` message

Problem/Motivation

Right now, when a folder cannot be created, it tells us that it cannot. But it doesn't say what folder it is. Let's add that context so it is more clear what is happening and what folder couldn't be created.

Proposed resolution

Add the folder being created do the trigger_error.

Remaining tasks

User interface changes

API changes

Data model changes

Release notes snippet