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/notifications-node/package.json

@@ -38,12 +38,7 @@
   },
   "dependencies": {
     "@backstage/backend-plugin-api": "workspace:^",
-    "@backstage/catalog-client": "workspace:^",
-    "@backstage/catalog-model": "workspace:^",
-    "@backstage/plugin-notifications-common": "workspace:^",
-    "@backstage/plugin-signals-node": "workspace:^",
-    "knex": "^3.0.0",
-    "uuid": "^11.0.0"
+    "@backstage/plugin-notifications-common": "workspace:^"
   },
   "devDependencies": {
     "@backstage/backend-test-utils": "workspace:^",