display_name_with_default is hard to remember to use

Description

Because it's hard to remember, it leads to inconsistent use (https://github.com/edx/edx-platform/pull/7496, for example). It would be better to be able to override the `display_name` descriptor object for the whole platform so that, when read, it gives the url_name default, and when written it overrites data correctly.

Perhaps this could be done at the FieldData level, by defining a default function in that class that knows about display_name?

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Reporter

Calen Pennington

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