[FIX] Invalid domain part allowed in email during Login

[johnson-oragui]

Describe the bug
During the process of logging in for a user, the domain part of email is not properly validated, especially after the [.com, .tech, .net] part of the domain part. Users can login without email validated.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'https://staging.api-python.boilerplate.hng.tech/login'
2. Enter email '[email protected]'
3. Enter password 'Johnson1234#'
4. Click on login
5. See bug: User logs in successfully

Expected behavior
The backend should respond with an appropriate error message like "Invalid email domain part"

Screenshots
If applicable, add screenshots to help explain your problem.
ENTER INVALID EMAIL DURING LOGIN

INVALID EMAIL ALLOWED DURING LOGIN

Desktop (please complete the following information):

• Browser brave
• Version 22

Additional context
The invalid email should not be allowed for login, even if it was allowed during registration, the login data fields validation should be independent of the registration field validation.