Prepare to split marriage-abroad outcome for Italy
Prepare to split marriage-abroad outcome for Italy

The current outcome template
(outcome_opposite_sex_marriage_in_italy_when_residing_in_uk_or_italy) contains
two logical outcomes:

* One for residents of the UK
* One for residents of Italy

The outcome body contains a number of `if/else` statements that decide whether
to show content for residents of the UK, or for residents of Italy.

This change will make it easier to split the outcome in a subsequent commit.

Note. Residents of a third country who want to get married in Italy are handled
by the
outcome_opposite_sex_marriage_in_consular_cni_countries_when_residing_in_third_country
outcome. This is because Italy is in the `OS_CONSULAR_CNI_COUNTRIES` array
which means that `calculator.opposite_sex_consular_cni_country?` returns
`true`. You can see this method being used further up in the marriage-abroad
flow.

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