In order to get this component working it requires the first_published_at
values for day, month and year to be passed in when present. In addition
to whether it has been previously published.

These were previously pulled from the params. As you can get invalid
user input which we want to retain and re-render in the fields, we
can't do something like parsing the datetime from the object/fields
and pass that in as one paramater.

This updates the design in a few ways:

1. when the document has not been published on GOV.UK it uses
a checkbox instead of radios
2. removes time from the fields

I've also removed the shared view tests in the shared controller test
helpers testing the correct fields are rendered as this is now covered
in the tests for the component.

At the moment, when a user unchecks the previously published checkbox and
doesn't clear the date inputs, on an unsuccessful save the date inputs
retain the values because they're still present in the params.

This fixes this by pulling the values from the edition_params which
have been cleaned of the values in before actions.

Instead of using #try to check for the presence of the edition params,
I could have added an additional before_action which cleaned the params
as well as the edition params, but i'm a bit loathe to add even more
bloat to the controller.