Migrate creative format info to creative format UTM field

[SWannell]

Problem

For paid social (and email?) links, the creative format information is merged into the same field as creative content.

e.g. Image and "Aleppo Attack" are in the same UTM field, as per https://docs.google.com/spreadsheets/d/1pzD-kL0I-uG1RDmMqatHPOaYJfPGoVP5YEzHmm4lAZ0/edit#gid=1682837906

Solution

We should take advantage of the new utm_creative_format field for GA data.