Updated editor material component slots to support dynamic previews rendered with property overrides applied

Fixed scaling issues with labels used for images
Reduced updating previews and material component inspector to only apply after a value is committed
Storing cache of previously rendered material previews

Signed-off-by: Guthrie Adams <guthadam@amazon.com>

Gems/AtomLyIntegration/CommonFeatures/Code/Source/Material/EditorMaterialComponentInspector.cpp

@@ -170,6 +170,7 @@ namespace AZ
 
                 m_overviewImage = new QLabel(this);
                 m_overviewImage->setFixedSize(QSize(120, 120));
+                m_overviewImage->setScaledContents(true);
                 m_overviewImage->setVisible(false);
 
                 m_overviewText = new QLabel(this);
@@ -241,8 +242,14 @@ namespace AZ
 
                 m_overviewText->setText(materialInfo);
                 m_overviewText->setAlignment(Qt::AlignLeading | Qt::AlignLeft | Qt::AlignTop);
+
+                QPixmap pixmap;
+                EditorMaterialSystemComponentRequestBus::BroadcastResult(
+                    pixmap, &EditorMaterialSystemComponentRequestBus::Events::GetRenderedMaterialPreview, m_entityId,
+                    m_materialAssignmentId);
+                m_overviewImage->setPixmap(pixmap);
                 m_overviewImage->setVisible(true);
-                m_updatePreview = true;
+                m_updatePreview |= pixmap.isNull();
             }
 
             void MaterialPropertyInspector::AddUvNamesGroup()
@@ -400,7 +407,8 @@ namespace AZ
                     m_internalEditNotification = false;
                 }
 
-                m_updatePreview = true;
+                // m_updatePreview should be set to true here for continuous preview updates as slider/color properties change but needs
+                // throttling
             }
 
             void MaterialPropertyInspector::RunEditorMaterialFunctors()
@@ -779,5 +787,3 @@ namespace AZ
         } // namespace EditorMaterialComponentInspector
     } // namespace Render
 } // namespace AZ
-
-//#include <AtomLyIntegration/CommonFeatures/moc_EditorMaterialComponentInspector.cpp>