ExportMaterialProperty doesn't output any FColor data from noise expression node

FMaterialUtilities::ExportMaterialProperty doesn't take into account any noise expression nodes in the material when outputting the FColor array.

1. Download attached project
2. Right click .uproject and Generate Visual Studio Project files.
3. Open .sln and launch project via Visual Studio with "Local windows debugger"
4. In editor, open "default" level.
5. Put break point in Visual Studio in UDN315593GameMode.cpp at line 29.
6. PIE
7. Press "F"

RESULT:

Break point will hit, showing "Output" FColor TArray full of FColor( 0, 0, 0, 0 ) - Black - color data.

EXPECTED:

Noise expression is taken into account when ExportMaterialProperty is called.

Fix UE-51650

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