Sweep: add more unit tests for the GenerateConfirmCreds function

[sweep-ai[bot]]

Description

This pull request introduces additional unit tests for the GenerateConfirmCreds function within the auth package, aiming to enhance the test coverage and ensure the robustness of the credential generation process.

Summary

• Added comprehensive test cases for GenerateConfirmCreds in auth/confirm_test.go to validate successful operations, error handling, and field verification.
• Tests cover scenarios including successful credential generation, handling missing user ID or email, invalid email format, and simulated errors from the CreateConfirmCreds dependency.
• Ensures that generated credentials contain the correct user ID, email, a 32-character code, and valid CreatedAt and ExpiresAt timestamps.
• Utilizes dbtest.NewDB(t) for database interactions, ensuring tests run with a clean state.

Fixes #4.

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Rollback Files For Sweep

• [ ] Rollback changes to auth/confirm_test.go

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