Fix/remove hardcoded aws region

[Samama251251]

Summary

This pull request refactors the authentication controller to use the AWS region specified in the configuration file (config.prod.yml) instead of a hardcoded value. This change enhances the flexibility and configurability of the application, allowing it to adapt to different deployment environments without code changes.

Changes

• Updated functions in auth.go to load AWS configuration using the region from the config file.
• Fixed a typo in the config.go file where the openai struct's YAML tag was missing a closing quote.

Testing

• Verified that the application correctly loads the AWS region from the configuration file.
• Ensured that all authentication-related functionalities (sign-up, login, password reset, etc.) work as expected with the updated configuration.

Additional Notes

• This change requires the config.prod.yml file to have the correct AWS region specified under the cognito section.

[Samama251251]

Currently in functions of the auth controller aws reigon is hardcoded. In my pull request I have removed these harcode reigons and configured them to be used from config.prod.yml file