[ON HOLD] Allow adding issues from different organizations in beta boards

[GiuliaTeggi]

We want to be able to add issues from any organization into project beta boards (e.g. adding fastify issues on a nearform beta board). Right now this is not possible because of the limitations of the projects beta API: addProjectNextItem can't create a card into the board that has a reference to an issue or PR from another organization. The api returns Error This project item doesn't belong to correct owner if the issue doesn't belong to the same org that owns the board.

There are some open questions in the community regarding this limitation:

• https://github.community/t/error-this-project-item-doesnt-belong-to-correct-owner/221889
• https://github.community/t/adding-pr-from-one-org-to-a-project-board-in-another-org/231085

There's nothing mentioning this feature in particular on the github public roadmap https://github.com/orgs/github/projects/4247/views/1 although projects beta feature parity with classic project boards is something that is being worked on: github/roadmap#287 so it's worth keeping an eye on these developments.