[Import] Add tests for contact type & contact subtype handling

[eileenmcnaughton]

Overview

[Import] Add tests for contact type & contact subtype handling

Before

No tests to cover what happens when you update a contact with an external identifier match and
a) a different contact type or
b) a different contact subtype

After

Tests lock in what happens which turns out to be
a) no update if the contact type doesn't match
b) subtype is replaced on update

Technical Details

There is no real change to the non-test code. I had to add an early return due to an enotice but the code would otherwise return the same value here

Comments

[civibot]

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