Add test stubs for Lts/Common components to satisfy policy requirements

- Created 139 test files covering all Lts/Common module components
- Includes tests for CodeGen, LtsAppDescriptor, LtsAppManager, LtsCoordTrans,
  LtsElevation, LtsLicence, LtsLogin, LtsMultiMonitor, LtsNotification,
  LtsPluginManager, LtsProtocol, LtsProjection, VNC, and CustomViews
- Updated tests/CMakeLists.txt with dynamic file(GLOB) for test collection
- Moved coordTransTests from CommonUnitTestsPlaceholder/ to tests/
- All tests follow policy naming conventions (test_<name>.cpp)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

qt6-after/qt6-migrated-benchmark/tests/test_lts_app_descriptor.cpp

@@ -0,0 +1,55 @@
+#include "lts_app_descriptor.h"
+#include <QJsonObject>
+#include <QJsonArray>
+#include <QString>
+#include <QStringList>
+#include <QtTest/QtTest>
+
+namespace LtsAppDescriptor
+{
+
+class TestLtsAppDescriptor : public QObject
+{
+    Q_OBJECT
+
+private slots:
+    void testPluginInfoCreation();
+    void testPluginInfoFlagOperations();
+    void testAppDescriptionDefaultConstruction();
+};
+
+void TestLtsAppDescriptor::testPluginInfoCreation()
+{
+    PluginInfo pluginInfo;
+    pluginInfo.iid = "test.plugin.iid";
+    pluginInfo.type = PluginInfo::PluginType::GUI;
+    pluginInfo.flags = PluginInfo::Flag::None;
+
+    QCOMPARE(pluginInfo.iid, QString("test.plugin.iid"));
+    QCOMPARE(pluginInfo.type, PluginInfo::PluginType::GUI);
+}
+
+void TestLtsAppDescriptor::testPluginInfoFlagOperations()
+{
+    PluginInfo pluginInfo;
+    pluginInfo.flags = PluginInfo::Flag::None;
+
+    addOptionToPlugin(pluginInfo, PluginInfo::Flag::Mandatory);
+    QVERIFY(pluginInfo.flags & PluginInfo::Flag::Mandatory);
+
+    addOptionToPlugin(pluginInfo, PluginInfo::Flag::Autostart);
+    QVERIFY(pluginInfo.flags & PluginInfo::Flag::Mandatory);
+    QVERIFY(pluginInfo.flags & PluginInfo::Flag::Autostart);
+}
+
+void TestLtsAppDescriptor::testAppDescriptionDefaultConstruction()
+{
+    AppDescription appDesc;
+    QVERIFY(appDesc.plugins.isEmpty());
+    QVERIFY(appDesc.lastErrors.isEmpty());
+}
+
+} // namespace LtsAppDescriptor
+
+QTEST_MAIN(LtsAppDescriptor::TestLtsAppDescriptor)
+#include "test_lts_app_descriptor.moc"