fix: move backend-test-utils to devDependencies

The backend-test-utils should only be used as devDependencies. Otherwise they might cause trouble
while installing related plugins in docker images.

Signed-off-by: Dominik Schwank <dominik.schwank@sda.se>

plugins/bazaar-backend/package.json

@@ -25,7 +25,6 @@
   "dependencies": {
     "@backstage/backend-common": "workspace:^",
     "@backstage/backend-plugin-api": "workspace:^",
-    "@backstage/backend-test-utils": "workspace:^",
     "@backstage/config": "workspace:^",
     "@backstage/errors": "workspace:^",
     "@backstage/plugin-auth-node": "workspace:^",
@@ -37,6 +36,7 @@
     "yn": "^4.0.0"
   },
   "devDependencies": {
+    "@backstage/backend-test-utils": "workspace:^",
     "@backstage/cli": "workspace:^"
   },
   "files": [