iOS: use dedicated classes to create run workers

Change-Id: I3ba7b75edf69b9cf88726132f154de5c4cc7ca7b
Reviewed-by: Eike Ziller <eike.ziller@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>

src/plugins/ios/iosplugin.h

@@ -5,8 +5,7 @@
 
 #include <extensionsystem/iplugin.h>
 
-namespace Ios {
-namespace Internal {
+namespace Ios::Internal {
 
 class IosPlugin final : public ExtensionSystem::IPlugin
 {
@@ -23,5 +22,4 @@ private:
     class IosPluginPrivate *d = nullptr;
 };
 
-} // namespace Internal
-} // namespace Ios
+} // Ios::Internal