feat(UpdateUser): resend verification on email change and fix validation translation

[rdehnhardt]

When the user’s email is changed, triggers a verification email to ensure the new address is valid.

Includes a test (UpdateUser) to assert that the notification is sent in this scenario.

Fixed email verification reset when updating non-email fields

Previously, updating any user attribute (e.g., avatar) would unintentionally set email_verified_at to null due to the conditional logic always evaluating to true when email wasn't present in the attributes array.

Changed the condition to explicitly check if the email key exists in the attributes array before comparing values, ensuring email_verified_at is only reset when the email is actually being changed.