Fix logout API validation messages

[krschan]

Fixes from PullRequest: #105

1. Fix Validation Message for Reusing Token

   • Ensure the validation message is accurate when the user attempts to log out using the same token in Postman.
   • Modify the response to give a more specific error message when the same token is reused.

2. Update Response When No Token is Provided

   • Modify the response when the user doesn't provide a token in Postman for the logout API.
   • The error message should be similar to the one from the register-step-two API.

3. Test API Response

   • Write test cases to verify that the validation message is accurate when the user attempts to log out without providing a token.
   • Ensure that the error message is consistent with the expected format for missing token scenarios.

[poksyy]

@krschan The second part of the issue will have to be created because it is more complex and not directly related to the first part.

Backend messages for token validation will need to be improved.

CustomAuthenticationEntryPoint.java and valideToken method on JwtService.java