Quickly connect all articles in a snippet to an imported resource

[elpoelma]

Overview

This PR adds a utility button to the snippet-editor sidebar which allows you to quickly connect all non-connected articles in a snippet to an imported resource.

• Button is greyed out if all articles are connected
• The resource URI is formed as follows: http://example.org/imported-decision-${snippetList.id}

Setup

None

How to test/reproduce

• Start the frontend
• Open a snippet which contains articles that are not connected to an imported resource yet
• Click the connect button + ensure it greys out
• Ensure all articles are now connected through the http://data.europa.eu/eli/ontology#has_part predicate
• Save the snippet and go back to it's snippet-list edit page
• The imported resource should now correctly show up

Challenges/Uncertainties

• As this is an internal tool, I didn't bother with translations.

Checks PR readiness

• UI: works on smaller screen sizes
• UI: feedback for any loading/error states
• Check cancel/go-back flows
• Check database state correct when deleting/updating (especially regarding relationships)
• changelog
• npm lint
• no new deprecations