Squish Tests: Web Links work correctly

As a developer I would like to verify the following behaviour using Squish:

- Go to the `Web Links` perspective.
- Verify that all links are displayed and open correctly.

#### Additional info:
To see if links open we can check if when a link is clicked a new window is opened.
To verify if the links work correctly we can use the `url` property of the link object and Python `requests`. This way we don't have to rely on checking the newly opened webpage as that might change.