[Interchange] Adding fbx file to monitored folder triggered legacy import

The import dialog window is the legacy one and not the Interchange one.

Auto reimport of modified FBX seems to be working properly with legacy or interchange selected depending on the CVar

Reported here https://forums.unrealengine.com/t/can-monitor-content-directories-trigger-interchange-importing/1892617

1) Create a project

2) go into editor preference > loading & Saving, add a directory to monitor.

For example the D:/Temp/Fbx/ to be map to /Game/Fbx/

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3) make sure interchange is activated for FBX (especially before 5.5) with the following CVar

Interchange.FeatureFlags.Import.FBX true

4) copy the fbx file into the D:/Temp/Fbx/ folder

5) Go back to UE and select import in the dialog highlighting about a change in source content file

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