fix (a11): add aria-invalid to career form fields

[virus-rpi]

Changes:

• set aria-invalid to true for all input components if an error message is there
• add aria-describedby for all input components to the id of the error message element if there is an error
• add id to all error message elements
• add aria-labelledby to checkbox if the label is set
• add id to checkbox label

Note:
Because the useForm is set to mode: 'onSubmit' the aria-invalid flag only changes after the first submit. Changing the mode to 'onChange' would fix that but it would also change the behaviour of the form.

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[hofmann-felix]

Thank you for taking care of this, works great 💪

However, I think that the implementation can still be improved a little. Could you please take a look at the two comments?

[hofmann-felix]

Works nice 🙌

[hofmann-felix]

I just noticed that all fields have the aria-required={true} attribute even if they are not required. Can you please fix this in the scope of this PR?

[hofmann-felix]

Awesome 🚀