Work item quick action: zoom

Problem

We need to support all quick actions currently available on legacy issues.

Proposal

• Add support for /zoom quick action that behaves exactly the same as on legacy issues (https://docs.gitlab.com/ee/user/project/issues/associate_zoom_meeting.html)
• Add support for /remove_zoom quick action that behaves exactly the same as on legacy issues (https://docs.gitlab.com/ee/user/project/issues/associate_zoom_meeting.html#removing-an-existing-zoom-meeting-from-an-issue).
• Using the zoom quick action in a work item places the Zoom URL in a Linked Resources widget. Backend was added in #372482 (closed)