Update the Media Selector's pre-import Attachment Details shown to user

[bmattb]

Feature description

As Unsplash we want to change the details presented in the Media Selector Attachment details so as to provide additional context to the user such as the username of the image provider. Since this addition will require the use of labels for context, the rest of the meta provided has also been updated to include labels.

Currently, pre-import, Attachment details appear as so:

As per the mocks in https://github.com/xwp/unsplash-wp/issues/125 this will now appear as this:

In addition to now showing the Unsplash submittor's username and labels for the meta fields, this update now presents the users with a link to the original Unsplash image

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Acceptance criteria

• A user who has selected an image in the Unsplash Media selector is presented the meta as laid out in https://github.com/xwp/unsplash-wp/issues/125
• A user is now presented with the username of the submittor
• A user can click the link in the username and be directed to that user's Unsplash profile page in a new tab

Implementation brief

• Override the details view in backbone.
• Create a custom template of attachment details.
• Add required fields to rest api responses in wp_prepare_attachment_for_js method.
• Implement these fields in a custom templetes.
• Add E2E and unit tests.

QA testing instructions

• From the Unsplash Media Selector or Media Library Unsplash view search and select an image
• confirm that the layout of the meta presented is now updated to align with https://github.com/xwp/unsplash-wp/issues/125
• validate that the link to the Unsplash username is clickable and opens a new tab to the user's profile page on Unsplash

Demo

Changelog entry

[bmattb]

Updated the issue title and description to clarify that this is specific to pre-import attachment details view, that the link to the Unsplash image has now been added, and that labels have been added to this view as well.

[csossi]

Verified in QA