Refactoring the logic for displaying PR links in the student's profile.

[dzmitry-varabei]

If you open a student's profile, for example:
https://app.rs.school/profile?githubId=mrhoft,

and then open the course progress in the Student Statistics widget,
in the pop-up window that appears, there will be links to pull requests for the completed tasks.

It is necessary to debug and, if possible, refactor the logic for loading and displaying these links.