An issue can be linked to by ID even if link and browse permissions are absent

Problem Definition:

If you remove the Link Issues Permission and Browse Projects Permission a user can still create a link if they use the issue key.

Steps to Reproduce

1. Create a Project Role and remove the "Browse Projects" and "Link Issues" permissions from that role in a target-project.
2. Create a link using the Issue ID

This will prevent a user from seeing the link on the main issue page, however, the link still shows as being created in the Activity Tab.