Fix / Improve form validation on account page

[MelissaDTH]

This PR

• Fixes the logic of the aria-invalid attribute on the TextField component, to ensure it is true when an error occurs if a value is inputted
  • The DemoConfigDialog and PersonalDetailsForm snapshot files are also updated, where errors are intentionally being passed. As a result, aria-invalid is correctly set to true for these affected fields
• We ensure that the red error message disappears upon submit. If the API returns any errors, we re-display the error message (this is conform the Sign Up and Sign In flow)
  • In the Account component, we currently utilise the Form component. Ideally, it should be refactored to follow the useForm flow similar to the RegistrationForm. However, this is a big refactor. Because of that, we're unable to utilize a handleBlur event for validation after a new input (which was originally wanted in the ticket).
• Solves: OTT-970

[royschut]

🏄‍♂️

[langemike]

LGTM!