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/comment-service-2/src/Middleware/Auth.ts

@@ -2,7 +2,7 @@ import jwt, { Secret, JwtPayload } from 'jsonwebtoken';
 import { Request, Response, NextFunction } from 'express';
 import Config from '../../config'
 
-export const SECRET_KEY: Secret = Config.JWT_SECRET;
+export const SECRET_KEY: Secret = process.env.JWT_PRIVATE_KEY || "";
 
 export interface CustomJWTRequest extends Request {
  token?: string | JwtPayload | TokenData;