Collection of contributions: changing the order

[SimoneZaza]

Description

As an admin, I want to be able to change the order in a callout with a collection of links/posts/whiteboards

Acceptance criteria

UI:

• [ ] Add menu item to callout menu: Sort Contributions with mui icon: SwapVerticalCircleOutlined, for:
• Call for posts
• Call for whiteboards
• Collection of links and documents
• NB this is only for contributions, not for comments!
• [ ] This opens dialog with drag & drop component (that's currently used in the innovation flow settings dialog) showing the titles of the links/posts/whiteboards
• [ ] Draggable items are the contributions, thus:
• posts in call for posts,
• whiteboards in a call for whiteboards,
• links in a collection of links
• [ ] Default position for new contribution (not for comments): on top, first one

Server:

• [ ] Contribution entity to be updated to have a sortOrder field, like on Callouts

Additional Context

Figma link: https://www.figma.com/file/SiA2BQY2pym2W1m5ZqcXOe/Collection-of-contributions%3A-changing-the-order?type=design&node-id=0%3A1&mode=design&t=4mGMtwd090GNAxAe-1