Remove unused express and supertest deps from catalog-node

These dependencies were added but never imported or used in the
package source or tests.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Signed-off-by: Fredrik Adelöw <freben@spotify.com>

yarn.lock

@@ -5347,13 +5347,8 @@ __metadata:
     "@backstage/plugin-permission-node": "workspace:^"
     "@backstage/types": "workspace:^"
     "@opentelemetry/api": "npm:^1.9.0"
-    "@types/express": "npm:^4.17.6"
-    "@types/supertest": "npm:^2.0.8"
-    express: "npm:^4.22.0"
-    express-promise-router: "npm:^4.1.0"
     lodash: "npm:^4.17.21"
     msw: "npm:^1.0.0"
-    supertest: "npm:^7.0.0"
     yaml: "npm:^2.0.0"
   peerDependencies:
     "@backstage/backend-test-utils": "workspace:^"