[ticket/12334] Add PROFILE_FIELD_VALUE_RAW template var

Completed original PR #2218 by @PayBas, add unit tests within the new CPF unit tests

[PHPBB3-12334](https://tracker.phpbb.com/browse/PHPBB3-12334)
The description should be unique for each test case.
So e.g. here you say why its null and on the next case why it is 0