Implement Mongo Seeder v2

What does this MR do?

Adds seeding to User and Questions databases with following env variables to control it:

• ENABLE_QUESTION_DB_SEEDING.
• ENABLE_USER_DB_SEEDING.

Testing

• Ensure ENABLE_QUESTION_DB_SEEDING is set to true in docker-compose.
• Ensure ENABLE_USER_DB_SEEDING is set to true in docker-compose.
• Ensure Docker's MongoDB instances have no documents in Users and Questions DBs.
• Run docker compose up --build.
• Login as with username 'admin' and password 'password'.
• Question appears on page.

Relevant issues

Fixes missing seeding.

backend-services/user-service/server.js

@@ -3,6 +3,8 @@ import cors from 'cors';
 import morgan from 'morgan';
 import connect from './database/conn.js'
 import router from './router/route.js'
+import bcrypt from "bcrypt";
+import UserModel from "./model/User.model.js";
 
 const app = express();
 
@@ -22,8 +24,20 @@ app.get('/', (req, res) => {
 app.use('/api', router)
 
 // Start server only when we have valid connection
-connect().then(() => {
+connect().then(async () => {
     try {
+        const hashedPassword = await bcrypt.hash("password", 10);
+        
+        const admin = new UserModel({
+            username: "admin",
+            password: hashedPassword,
+            email: "admin@email.com",
+            profile: "",
+            admin: true
+        })
+
+        admin.save()
+        
         app.listen(port, () => {
             console.log(`Server connected to http://localhost:${port}`);
         })