External pull request on overview board

**User story**

As a developer I want to have external pull requests and issues on the overview boards, so that there is 1 overview of all the open issues and pull requests.

**Acceptance criteria**

Issues and pull request from external sources need to be shown in these boards:
https://github.com/orgs/com-pas/projects/2
https://github.com/orgs/com-pas/projects/1
