fix: displayName return undefined and drop displayName from user table (#505)

server/package.json

@@ -45,6 +45,7 @@
     "@paljs/plugins": "^5.3.3",
     "@prisma/client": "^4.13.0",
     "@types/lodash.camelcase": "^4.3.7",
+    "@types/lodash.merge": "^4.6.7",
     "add": "^2.0.6",
     "apollo-server-express": "^3.12.0",
     "axios": "^1.4.0",
@@ -60,6 +61,7 @@
     "lodash.camelcase": "^4.3.0",
     "lodash.isobject": "^3.0.2",
     "lodash.kebabcase": "^4.1.1",
+    "lodash.merge": "^4.6.2",
     "ms": "^2.1.3",
     "passport": "^0.6.0",
     "passport-google-oauth20": "^2.0.0",