[LYN-2878] Attempt to fix deadlocks that occur when the Editor loads surface tag assets.

I wasn't able to reproduce the deadlock, but from the reported callstack, the following lock inversion happens:
* EditorSurfaceDataSystemComponent::OnCatalogLoaded locked the AssetCatalogRequestBus mutex by calling EnumerateAssets, and then locked m_assetMutex inside GetAsset->FindOrCreateAsset inside the enumerate callback.
* Loading threads would lock m_assetMutex in AssetManager::ValidateAndRegisterAssetLoading, then lock the AssetCatalogRequestBus inside the Asset<T> copy constructor when calling UpdateDebugStatus when the constructor calls SetData->UpgradeAssetInfo->UpdateAssetInfo->AssetCatalogRequestBus::GetAssetInfoById

This should solve the lock inversion on both sides of the problem:
* UpdateDebugStatus now takes in a const ref instead of a copy, so the copy constructor isn't called.
* EditorSurfaceDataSystemComponent::OnCatalogLoaded is rewritten to call GetAsset outside of the enumeration call.

As a bonus, this also removes the blocking load call.  The rest of the code already supports asynchronous refreshes as the list assets are added / modified / removed, so this code was changed to leverage the asynchronous refreshes as well.

Code/Framework/AzCore/AzCore/Asset/AssetManager.cpp

@@ -1117,7 +1117,7 @@ namespace AZ
             return asset;
         }
 
-        void AssetManager::UpdateDebugStatus(AZ::Data::Asset<AZ::Data::AssetData> asset)
+        void AssetManager::UpdateDebugStatus(const AZ::Data::Asset<AZ::Data::AssetData>& asset)
         {
             if(!m_debugAssetEvents)
             {

Code/Framework/AzCore/AzCore/Asset/AssetManager.h

@@ -358,7 +358,7 @@ namespace AZ
 
             Asset<AssetData> GetAssetInternal(const AssetId& assetId, const AssetType& assetType, AssetLoadBehavior assetReferenceLoadBehavior, const AssetLoadParameters& loadParams = AssetLoadParameters{}, AssetInfo assetInfo = AssetInfo(), bool signalLoaded = false);
 
-            void UpdateDebugStatus(AZ::Data::Asset<AZ::Data::AssetData> asset);
+            void UpdateDebugStatus(const AZ::Data::Asset<AZ::Data::AssetData>& asset);
 
             /**
             * Gets a root asset and dependencies as individual async loads if necessary.