Repos can be refreshed through Project Manager individually or all at once

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

Code/Tools/ProjectManager/Source/GemRepo/GemRepoScreen.h

@@ -40,6 +40,8 @@ namespace O3DE::ProjectManager
     public slots:
         void HandleAddRepoButton();
         void HandleRemoveRepoButton(const QModelIndex& modelIndex);
+        void HandleRefreshAllButton();
+        void HandleRefreshRepoButton(const QModelIndex& modelIndex);
 
     private:
         void FillModel();