Afform - Set data values in quick-add popup

[colemanw]

Overview

Fixes https://lab.civicrm.org/dev/core/-/issues/5477

When using a quick-add form, this ensures the predetermined data values from the parent form's entity will be copied to the newly-created entity in the popup form.

Before

Create a form with an Individual and "Existing Individual" autocomplete field. Enable the "quick add" button.
In the values section on the left, pick a contact subtype for the individual.
Now use the form and use the quick add button to create a new contact.
Note that the new contact did not get the subtype.

Comments

I wanted to use Api4TestTrait in the unit test so I had to do some general cleanup in the Afform test suite to ditch the Api3TestTrait.

[civibot]

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