[11.x] Make DB::usingConnection() respect read/write type #50806
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fixes #50804
Currently when DatabaseManager::connection() is used with default connection it doesn't get a $name param and it is resolved within a subsequent call to DatabaseManager::parseConnectionName() and then use only the first $database segment without the type to look for already created connection instance so the ::write part won't take effect.
This PR solves the issue by resolving the default connection's name before parsing it.