Adds Inspector to Gem Repo Screen (#4242)

* Adds the gem repo screen with the UI built but with mocked data and not connected to the o3de scripts

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

* Changed name of added to enabled, disabled define, removed unused functions

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

* Added Repo Screen Inspector UI

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

* Addressed minor PR feedback

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

* Add some more minor PR changes

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

Code/Tools/ProjectManager/Source/GemRepo/GemRepoListView.cpp

@@ -11,13 +11,14 @@
 
 namespace O3DE::ProjectManager
 {
-    GemRepoListView::GemRepoListView(QAbstractItemModel* model, QWidget* parent)
+    GemRepoListView::GemRepoListView(QAbstractItemModel* model, QItemSelectionModel* selectionModel, QWidget* parent)
         : QListView(parent)
     {
         setObjectName("gemRepoListView");
         setVerticalScrollMode(QAbstractItemView::ScrollPerPixel);
 
         setModel(model);
+        setSelectionModel(selectionModel);
         setItemDelegate(new GemRepoItemDelegate(model, this));
     }
 } // namespace O3DE::ProjectManager