feat: prevent user form login before conforming his email

[RMCampos]

This pull request implements a complete "email not confirmed" flow for user login. It introduces backend validation to prevent unconfirmed users from logging in, provides a clear error message, and updates the frontend to display a resend confirmation email button when appropriate. Additionally, the changes enhance internationalization support for the new messages and improve test coverage for these scenarios.

Backend: Email Confirmation Enforcement

• Added a new EmailNotConfirmedException and updated AuthService to throw this exception if a user attempts to log in without confirming their email. This ensures only confirmed users can authenticate. [1] [2] [3]
• Updated backend tests in AuthServiceTest to cover both the confirmed and unconfirmed email login scenarios, ensuring the new logic is robust and well-tested. [1] [2] [3] [4] [5]

Frontend: Login Form and Resend Flow

• Enhanced the LoginForm component to detect the "Email not confirmed!" error, display a user-friendly message, and show a "Resend Confirmation Email" button. The resend button is also shown after a successful resend action. [1] [2] [3] [4] [5] [6] [7]
• Added a new test in LoginForm.test.tsx to verify that the resend button appears when login fails due to an unconfirmed email.

Internationalization and Server Response Mapping

• Updated serverResponses and serverResponsesTranslations to include keys and translations for "Email not confirmed!" and "Confirmation email re-sent! Please check the spam folder." in multiple languages, ensuring a consistent user experience. [1] [2] [3] [4]

Other Minor Fixes

• Adjusted a test in SidebarProvider.test.tsx to expect the correct page route after navigation.