Custom Select: Questionable attributes

[mfranzke]

The generic surrounding component div element has an aria-invalid-HTML-attribute defined, which doesn't harm, but even also doesn't benefit from that attribute, as those don't change anything on generic elements.

• We might either want to change this div to a fieldset-HTML-element, on which an aria-invalid-HTML-attribute actually makes sense (needs to get verified)
• Or remove that attribute in total, mainly to get clean and meaningful code.

core-web/packages/components/src/components/custom-select/custom-select.lite.tsx

Line 898 in 17989d0

aria-invalid={state._validity === 'invalid'}

Additionally some elements in the page are even also referencing this generic element via the form-HTML-attribute:

• core-web/packages/components/src/components/custom-select/custom-select.lite.tsx

  Line 1020 in 17989d0

  form={state._id}

• core-web/packages/components/src/components/custom-select/custom-select.lite.tsx

  Line 1052 in 17989d0

  form={state._id}

• core-web/packages/components/src/components/custom-select/custom-select.lite.tsx

  Line 1153 in 17989d0

  form={state._id}

• core-web/packages/components/src/components/custom-select/custom-select.lite.tsx

  Line 1175 in 17989d0

  form={state._id}

Even also this reference doesn't make any sense to that generic div-HTML-element.

We should think about what we wanted to achieve by these references and remove or correct those depending on the purpose.