fix: delete existing users before seeding db (#40423)

tools/scripts/seed/seedAuthUser.js

@@ -153,23 +153,36 @@ MongoClient.connect(MONGOHQ_URL, { useNewUrlParser: true }, (err, client) => {
   const user = db.collection('user');
 
   if (process.argv[2] === 'certUser') {
-    user.deleteOne({ _id: ObjectId('5fa2db00a25c1c1fa49ce067') }, err => {
+    user.deleteMany(
+      {
+        _id: {
+          $in: [
+            ObjectId('5fa2db00a25c1c1fa49ce067'),
+            ObjectId('5bd30e0f1caf6ac3ddddddb5'),
+            ObjectId('5bd30e0f1caf6ac3ddddddb9')
+          ]
+        }
+      },
+      err => {
         handleError(err, client);
 
         try {
           user.insertOne(fullyCertifiedUser);
+          user.insertOne(blankUser);
         } catch (e) {
           handleError(e, client);
         } finally {
           log('local auth user seed complete');
           client.close();
         }
-    });
+      }
+    );
   } else {
     user.deleteMany(
       {
         _id: {
           $in: [
+            ObjectId('5fa2db00a25c1c1fa49ce067'),
             ObjectId('5bd30e0f1caf6ac3ddddddb5'),
             ObjectId('5bd30e0f1caf6ac3ddddddb9')
           ]