Sweep: add more unit tests for the GenerateConfirmCreds function

[sweep-ai[bot]]

Description

This pull request enhances the test coverage for the GenerateConfirmCreds function by adding several new test cases. These tests ensure the function's robustness in generating credentials and handling edge cases effectively.

Summary

• Added comprehensive tests for the GenerateConfirmCreds function in confirm/confirm_test.go.
• Ensured that the generated selector, verifier, and token are not empty and are correctly encoded in base64.
• Validated that the selector and verifier correctly match the SHA-512 hash of the respective halves of the decoded token.
• Included tests for scenarios where the token generator fails, the token is malformed, or the token has an invalid length after decoding.

Fixes #4.

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Rollback Files For Sweep

• [ ] Rollback changes to confirm/confirm_test.go

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