[TASK] Add unit tests for spamProtectEmailAddresses

Adding unit tests for TypoScript config property
spamProtectEmailAddresses and its variations.

Resolves: #71716
Releases: master, 6.2
Change-Id: I368806cdfcdb9c2cc05641892df56f3127190789
Reviewed-on: https://review.typo3.org/44815


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>