[JS/Go] Implement build report page

[sergey-shambir]

This action triggered from page described in template src/frontend_server/tpl/student_solutions.ejs URL: /student/commit?id=<%=solution.commit_id%>

• [ ] add handler method to the Frontend (see student.mjs), add this method to routes.mjs with proper URL
• [ ] add method GET commit/{id}/report to the Backend REST API (see backendapi.go and routes.go)
• [ ] implement Backend method with existing Builder REST API "/build/report/{uuid}" (see routes.go in Builder source code)
• [ ] test manually on localhost:8080/student/solutions page
• [ ] add new scenario or extend existing in run_backend_tests.py

[sergey-shambir]

Obsolete