code-coverage-backend: migrate to support new auth services

Co-authored-by: Fredrik Adelöw <freben@gmail.com>
Co-authored-by: Carl-Erik Bergström <cbergstrom@spotify.com>
Co-authored-by: blam <ben@blam.sh>
Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

plugins/code-coverage-backend/package.json

@@ -48,6 +48,7 @@
     "yn": "^4.0.0"
   },
   "devDependencies": {
+    "@backstage/backend-test-utils": "workspace:^",
     "@backstage/cli": "workspace:^",
     "@types/body-parser-xml": "^2.0.2",
     "@types/supertest": "^2.0.8",