fix: server crashes on login if password is not provided in the request payload

[iConnell]

Description

This pr addrresses the issue in /api/v1/auth/login where the server crashes if the password field is not provided in the request payload. It also does a minor refactor where it combines two import statements into one in users.schemas

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Related Issue (Link to issue ticket)

Fix: Server crashes on login if password is not provided in the request payload

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Motivation and Context

🚀 Stability: Prevents unnecessary server crashes due to missing input.
🔍 Proper Validation: Ensures the API returns a 422 Unprocessable Entity error for missing passwords.
🔐 Security Fix: Prevents exposing stack traces or internal errors due to unhandled missing input.

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How Has This Been Tested?

• I wrote unit tests to automatically test the fix works as expected
• I also tested it manually on postman and got the expected response
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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.