refactor: remove whole graphql implementation

packages/backend/package.json

@@ -23,8 +23,6 @@
   "dependencies": {
     "@bull-board/express": "^3.10.1",
     "@casl/ability": "^6.5.0",
-    "@graphql-tools/graphql-file-loader": "^7.3.4",
-    "@graphql-tools/load": "^7.5.2",
     "@node-saml/passport-saml": "^4.0.4",
     "@rudderstack/rudder-sdk-node": "^1.1.2",
     "@sentry/node": "^7.42.0",
@@ -41,11 +39,7 @@
     "express": "~4.18.2",
     "express-async-errors": "^3.1.1",
     "express-basic-auth": "^1.2.1",
-    "express-graphql": "^0.12.0",
     "fast-xml-parser": "^4.0.11",
-    "graphql-middleware": "^6.1.15",
-    "graphql-shield": "^7.5.0",
-    "graphql-tools": "^8.2.0",
     "handlebars": "^4.7.7",
     "http-errors": "~1.6.3",
     "http-proxy-agent": "^7.0.0",