[Due for payment 2026-01-28] [ECUK In-App 3DS] [App] Add test biometrics button to the troubleshoot menu

[JakubKorytko]

Part of Adding biometric 3DS authentication for Expensify Cards

Implement this section of the design doc. These changes should include:

• Adding the test biometrics button and connecting it to the Multifactor Authentication logic

PR: #79475

Issue Owner

Current Issue Owner: @JakubKorytko