[PEP-1194]: allow editors to view a preview of publish URL when scheduling.

[stanographer]

Jira Ticket

• https://vmproduct.atlassian.net/browse/PEP-1194

Sites PR

• https://github.com/nymag/sites/pull/11500

Description

Editors often need to share a link to an article prior to the article going live. When this happens, editors may accidentally leave of crucial parts of the url, like the yyyy/mm or .html

The goal of this ticket is to give editors an easy way to share a url for a story that is scheduled to go live or already published based on if a story is selected as “evergreen” and the “slug” field.

[coveralls]

coverage: 34.885% (-0.02%) from 34.907% when pulling dcbc37a701e15a087c06172ea2f81e36fe2df49c on ss-publish-url-preview-4 into 8d2f6e0b9f271c1e3a9c9dac7f45addd212cbd7b on master.