Register connection providers early, refs 4170

[mwjames]

This PR is made in reference to: #4170

This PR addresses or contains:

• Due to Check extension registration is complete, refs 1732 #4170 the check in ConnectionManager may happen to late due to how the ExtensionRegistry resolves the queue therefore register connection providers as soon as possible

This PR includes:

• Tests (unit/integration)
• CI build passed

Analysis

Due to SemanticCite being registered before SemanticMediaWiki it caused:

wfLoadExtension( 'SemanticCite' );
enableSemantics( 'example.org' );

[70c83752cac7731351c6966d] .../index.php/Main_Page RuntimeException from line 49 of ...\extensions\SemanticMediaWiki\src\Connection\ConnectionManager.php: mw.db is not registered as connection provider

Backtrace:

#0 ...\extensions\SemanticMediaWiki\src\Store.php(598): SMW\Connection\ConnectionManager->getConnection(string)
#1 ...\extensions\SemanticMediaWiki\src\SQLStore\SQLStore.php(656): SMW\Store->getConnection(string)
#2 ...\extensions\SemanticMediaWiki\src\SQLStore\SQLStoreFactory.php(409): SMW\SQLStore\SQLStore->getConnection(string)
#3 ...\extensions\SemanticMediaWiki\includes\storage\SQLStore\SMW_Sql3SmwIds.php(956): SMW\SQLStore\SQLStoreFactory->newPropertyTableHashes(SMW\SQLStore\EntityStore\IdCacheManager)
#4 ...\extensions\SemanticMediaWiki\includes\storage\SQLStore\SMW_Sql3SmwIds.php(152): SMWSql3SmwIds->initCache()
#5 ...\extensions\SemanticMediaWiki\src\SQLStore\SQLStoreFactory.php(133): SMWSql3SmwIds->__construct(SMW\Elastic\ElasticStore, SMW\SQLStore\SQLStoreFactory)
#6 ...\extensions\SemanticMediaWiki\src\SQLStore\SQLStore.php(158): SMW\SQLStore\SQLStoreFactory->newEntityTable()
#7 ...\extensions\SemanticMediaWiki\src\Elastic\ElasticStore.php(60): SMW\SQLStore\SQLStore->__construct()
#8 ...\extensions\SemanticMediaWiki\src\StoreFactory.php(61): SMW\Elastic\ElasticStore->__construct()
#9 ...\extensions\SemanticMediaWiki\src\StoreFactory.php(42): SMW\StoreFactory::newFromClass(string)
#10 ...\extensions\SemanticMediaWiki\src\Services\SharedServicesContainer.php(100): SMW\StoreFactory::getStore(string)
#11 [internal function]: SMW\Services\SharedServicesContainer->newStore(Onoi\CallbackContainer\CallbackContainerBuilder, string)
#12 ...\vendor\onoi\callback-container\src\CallbackContainerBuilder.php(260): call_user_func_array(array, array)
#13 ...\vendor\onoi\callback-container\src\CallbackContainerBuilder.php(288): Onoi\CallbackContainer\CallbackContainerBuilder->getReturnValueFromCallbackHandlerFor(string, array)
#14 ...\vendor\onoi\callback-container\src\CallbackContainerBuilder.php(195): Onoi\CallbackContainer\CallbackContainerBuilder->getReturnValueFromSingletonFor(string, array)
#15 ...\extensions\SemanticMediaWiki\src\Services\ServicesFactory.php(228): Onoi\CallbackContainer\CallbackContainerBuilder->singleton(string, NULL)
#16 ...\extensions\SemanticCite\SemanticCite.php(154): SMW\Services\ServicesFactory->getStore()
#17 ...\includes\Setup.php(938): SemanticCite::onExtensionFunction()
#18 ...\includes\WebStart.php(77): require_once(string)
#19 ...\index.php(39): require(string)
#20 {main}

The reason is that SemanticCite::onExtensionFunction is called before SemanticMediaWiki::onExtensionFunction. Use SemanticMediaWiki::initExtension which runs before the onExtensionFunction execution.