Bulk delete tags

It would be good to have a way to bulk delete tags. It's possible to copy a heap of text and paste it accidentally into the tags field which then creates a tag for every word in the pasted text. There isn't a way to undo this and it's time consuming to remove every tag. I occasionally get emails from users who have done this.

Start by locating the macOS tags field and the existing tag-management behavior. Confirm how tags are created and removed, then define the bulk-delete interaction so users can remove multiple accidentally created tags at once. Done means a user can select and delete multiple tags without removing them individually.

Written by the indexing model from the issue text.