fix: Fixed the bug on email validation

[johnson-oragui]

This Pull Request is intended to correct the bug that allows users to use an invalid email(non-existing domain part) for registration, login, request-magic-link, and reset-password.
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Description

This Pull Request is intended to correct the bug that allows users to use an invalid email(non-existing domain part) for registration, login, request-magic-link, and reset-password.
Prior to this PR, users were able to register, login with an invalid email like [email protected] or [email protected], but with this fix, the email validation on these four endpoints mentioned above are now properly validated.
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Related Issue (Link to issue ticket)

Invalid email on login

Invalid email on registration

invalid email on password reset

invalid email on magic-link

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Motivation and Context

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How Has This Been Tested?

This has been tested with pytest and postman.
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Screenshots (if appropriate - Postman, etc):

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Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
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Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[johnson-oragui]

@trevorjob

Kindly reviews