Added Menu to Gem Catalog with Action to Navigate to Gem Repo Screen (#4829)

* Added menu to Gem Catalog that with option to navigate to Gem Repo screen

Signed-off-by: nggieber <nggieber@amazon.com>

* Changed Goto to GoTo and added a tr

Signed-off-by: nggieber <nggieber@amazon.com>

* Gem repo button works from new project creation workflow as well and users are warned if they have pending changes in the gem catalog before changing screens.

Signed-off-by: nggieber <nggieber@amazon.com>

Code/Tools/ProjectManager/Source/EngineScreenCtrl.h

@@ -11,6 +11,8 @@
 #include <ScreenWidget.h>
 #endif
 
+QT_FORWARD_DECLARE_CLASS(QTabWidget)
+
 namespace O3DE::ProjectManager
 {
     QT_FORWARD_DECLARE_CLASS(EngineSettingsScreen)
@@ -26,7 +28,10 @@ namespace O3DE::ProjectManager
 
         QString GetTabText() override;
         bool IsTab() override;
+        bool ContainsScreen(ProjectManagerScreen screen) override;
+        void GoToScreen(ProjectManagerScreen screen) override;
 
+        QTabWidget* m_tabWidget = nullptr;
         EngineSettingsScreen* m_engineSettingsScreen = nullptr;
         GemRepoScreen* m_gemRepoScreen = nullptr;
     };