refact: change dbus api and service impl

1. change IconName and DisplayName to method
2. refactor impl of GetManagedObject and move it to global.h
3. refactor impl of JobService::status
4. add ut_job.cpp

Signed-off-by: ComixHe <heyuming@deepin.org>

src/dbus/applicationmanager1service.h

@@ -83,7 +83,8 @@ private:
 };
 
 template <typename T>
-QSharedPointer<ApplicationService> makeApplication(T &&source, ApplicationManager1Service *parent)
+QSharedPointer<ApplicationService> makeApplication(T &&source,
+                                                   ApplicationManager1Service *parent)  // NOTE: maybe we should refactor
 {
     static_assert(std::is_same_v<T, DesktopFile> or std::is_same_v<T, QString>, "param type must be QString or DesktopFile.");
     QString objectPath;