Add 'hidden' state to dkan_publishing workflow (round 2)

[clayliddell]

fixes WCMS-4889

The original PR (#3718) for this was reverted. This PR fixes some issues found related to unpublished nodes being visible from the frontend.

• Test coverage exists
• Documentation exists

QA Steps

Hidden State

1. Edit an existing dataset or create a new dataset.
   a. Select the "Publish (Hidden)" moderation state at the bottom of the form.
   b. Click Save.
2. Search for the hidden dataset.
   a. The dataset should not show up in the search results.
3. Navigate to the hidden dataset.
   a. It should be visible.
4. Unhide & publish the hidden dataset.
5. Search for the dataset.
   a. It should show up in the search results.

Archived State

1. Edit an existing dataset or create a new dataset.
   a. Select the "Archive" moderation state at the bottom of the form.
   b. Click Save.
2. Search for the archived dataset.
   a. The dataset should not show up in the search results.
3. Navigate to the archived dataset.
   a. It should not be visible.
4. Unarchive & publish the archived dataset.
5. Search for the dataset.
   a. It should show up in the search results.