chore: remove unused dependencies

Remove 30 dependencies across 18 packages that have no imports in
source code and are not peer dependencies of any other dependency.

Signed-off-by: Fredrik Adelöw <freben@spotify.com>
Made-with: Cursor

plugins/devtools-backend/package.json

@@ -55,9 +55,7 @@
     "express-promise-router": "^4.1.0",
     "fs-extra": "^11.0.0",
     "lodash": "^4.17.21",
-    "ping": "^0.4.1",
-    "semver": "^7.5.3",
-    "yn": "^4.0.0"
+    "ping": "^0.4.1"
   },
   "devDependencies": {
     "@backstage/backend-defaults": "workspace:^",