[tests] Combine TestFullyQualified(Explicit|Implicit)LinkDifferentFamilyParser
[tests] Combine TestFullyQualified(Explicit|Implicit)LinkDifferentFamilyParser

Change-Id: I3cd7d28f504c50ee2a8c668e57e734f1e4265b2b

wikimedia/pywikibot-core,wikimedia/pywikibot-core