Refactor HistoricEventsInterface to allow testing

CodeStyle

Update British Monarchs and Prime Ministers History files and Create a New Zealand Prime Ministers History File (#4978)

* Update BritishMonarchs.php

Updated to include the death of HM Queen Eliza

Update British Monarchs and Prime Ministers History files and Create a New Zealand Prime Ministers History File (#4978)

* Update BritishMonarchs.php

Updated to include the death of HM Queen Elizabeth II and also added HM King Charles III

* Update BritishPrimeMinisters.php

Added last two British Prime Ministers so file is now current

* Create NewZealandPrimeMinisters.php

Premiers & Prime Ministers of New Zealand

* Update ModuleService.php

Added new line to use the New Zealand Prime Ministers History File

* Update ModuleService.php

Add the extra line to allow New Zealand Prime Ministers History File to work!

* Update BritishMonarchs.php

Edited and updated file to include Charles III as current Monarch

* Update BritishPrimeMinisters.php

Updated PMs Names to that commonly used.

Added Notes with links to Wikipedia pages for each PM. Not all have been done, this is an example of what has been suggested.

* Update NewZealandPrimeMinisters.php

Removed Nu - Tirani

Removed Full Names in preference to names commonly used.

* Update BritishMonarchs.php

Added Note Links for Queen Elizabeth II & Charles III as examples.

Can be updated as required.

* Update BritishMonarchs.php

Hopefully corrected Errors

* Update BritishMonarchs.php

Hopefully resolved the format issue..

Thanks Franz

* Update BritishMonarchs.php

Either add wiki links to all entries or none of them.

* Update BritishPrimeMinisters.php

Either add wiki links to all entries or none of them.

* Update BritishPrimeMinisters.php

Add end date for Boris Johnson

* Update NewZealandPrimeMinisters.php

Make consistent with other similar modules

* Update ModuleService.php

Add to list of core modules

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Co-authored-by: Greg Roach <greg@subaqua.co.uk>

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