Add helper methods to create and execute save level dialogs

Changes in this commit :
- Added AreDirtyTemplatesPresent() method to PrefabSystemComponentInterface
- Added ConstructSaveLevelDialog() helper method to create the save level dialog
- Added ExecuteSavePrefabsDialog() helper method to create and execute the save prefabs dialog

Signed-off-by: srikappa-amzn <srikappa@amazon.com>

Code/Framework/AzToolsFramework/AzToolsFramework/Prefab/PrefabSystemComponent.cpp

@@ -753,6 +753,18 @@ namespace AzToolsFramework
             }
         }
 
+        bool PrefabSystemComponent::AreDirtyTemplatesPresent()
+        {
+            for (const auto& [id, templateObject] : m_templateIdMap)
+            {
+                if (IsTemplateDirty(id))
+                {
+                    return true;
+                }
+            }
+            return false;
+        }
+
         void PrefabSystemComponent::SaveAllDirtyTemplates()
         {
             for (auto& [id, templateObject] : m_templateIdMap)

Code/Framework/AzToolsFramework/AzToolsFramework/Prefab/PrefabSystemComponent.h

@@ -183,6 +183,8 @@ namespace AzToolsFramework
              */
             void SetTemplateDirtyFlag(const TemplateId& templateId, bool dirty) override;
 
+            bool AreDirtyTemplatesPresent() override;
+
             void SaveAllDirtyTemplates() override;
 
             //////////////////////////////////////////////////////////////////////////

Code/Framework/AzToolsFramework/AzToolsFramework/Prefab/PrefabSystemComponentInterface.h

@@ -49,6 +49,7 @@ namespace AzToolsFramework
 
             virtual bool IsTemplateDirty(const TemplateId& templateId) = 0;
             virtual void SetTemplateDirtyFlag(const TemplateId& templateId, bool dirty) = 0;
+            virtual bool AreDirtyTemplatesPresent() = 0;
             virtual void SaveAllDirtyTemplates() = 0;
 
             virtual PrefabDom& FindTemplateDom(TemplateId templateId) = 0;