Added testing for GET /project/{projectId}/grade/allGrades
Added testing for GET /project/{projectId}/grade/allGrades

KristinnGudmundurOgRagnar/VefthjonusturSkil2,KristinnGudmundurOgRagnar/VefthjonusturSkil2,KristinnGudmundurOgRagnar/VefthjonusturSkil2