Replace usages of deprecated wfWikiID()

[Func86]

The global function wfWikiID() is hard deprecated since 1.38, and its usages should be replaced with WikiMap::getCurrentWikiId().

This PR addresses or contains:

• https://phabricator.wikimedia.org/T298059

This PR includes:

• Tests (unit/integration)
• CI build passed

[krabina]

When I checkout your version, I get the following

Fatal error: Uncaught UnexpectedValueException: callback 'SemanticCite::initExtension' is not callable in includes/registration/ExtensionRegistry.php:525
Stack trace:
#0 includes/registration/ExtensionRegistry.php(279): ExtensionRegistry->exportExtractedData()
#1 includes/Setup.php(278): ExtensionRegistry->loadFromQueue()
#2 maintenance/doMaintenance.php(83): require_once('/home/knowledge...')
#3 maintenance/update.php(312): require_once('/home/knowledge...')
#4 {main}
  thrown in includes/registration/ExtensionRegistry.php on line 525

[kizule]

This is already done in #116 by @thomas-topway-it, so I think that this PR can be closed.