{LYN-4514} Engine updates to enable PAB for the Blast Gem (#2140)

* {LYN-4514} Engine updates to enable PAB for the Blast Gem

* Engine updates to enable Python Asset Building for the Blast Gem
* added API to detect IsPythonActive()
* ExportProductList behavior
* scene manifest usage of generated assetinfo
* updated ScriptProcessorRuleBehavior to handle OnPrepareForExport

Tests: new tests for scene behavior via ExportProduct

Signed-off-by: Jackson <23512001+jackalbe@users.noreply.github.com>

* updated base on PR feedback
added more comments for IsPythonActive()
added a serializeContext for export product list

Signed-off-by: Jackson <23512001+jackalbe@users.noreply.github.com>

Code/Framework/AzToolsFramework/AzToolsFramework/API/EditorPythonConsoleBus.h

@@ -63,6 +63,9 @@ namespace AzToolsFramework
         //! Signal the Python handler to stop
         virtual bool StopPython(bool silenceWarnings = false) = 0;
 
+        //! Query to determine if the Python VM has been initialized indicating an active state 
+        virtual bool IsPythonActive() = 0;
+
         //! Determines if the caller needs to wait for the Python VM to initialize (non-main thread only)
         virtual void WaitForInitialization() {}