Separate the ReviewRequestPageDataMixin from BuiltinFieldMixin
Review Request #10082 — Created July 13, 2018 and submitted
ReviewRequestPageDataMixinwas built on the
However, this requires that the field being represented be available on
the review request draft as
field_idor else the mixin will use the
review request instead. This is not ideal when the represented field is
derived state or not directly accessible as an attribute/property on the
review request draft, e.g., it is an attribute of the draft diff
Now the two are more separate and fields that require the old behaviour
inherit from both.
Ran unit tests.