fix: Signup email error

[Afonso-santos]

Remove register email error

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[reviewpad]

AI-Generated Summary: This pull request makes changes to the Signup component in the application. Specifically, it simplifies the Form.Item component used in the signup form. This change removes validation and error handling from the component, as well as a className assignment and help text. A closer review may be required to ensure user form interactions are not adversely affected by this change.

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[pedrofp4444]

Please check if your alterations really work, when I'm trying to register an account that already exists, it just doesn't do anything, there's no visual feedback as it is supposed to.