Improve quality of form-integration tests (api conformance of all form-controls)

[tlouisse]

As a follow-up for #2661, we can make sure regressions like this are prevented for all form controls.

Ideally these things (that come from form-core (LionField/FormControl)) should be tested here: https://github.com/ing-bank/lion/blob/master/packages/ui/components/form-integrations/test/model-value-consistency.test.js