Reimport settings for USD not getting stored

Legacy USD importer doesn't remember import options after editor restart. Issue affects both 5.7 and 5.8. The user's choice for "Kinds to Collapse" is stored as a editor preference rather than per asset import data (which doesn't seem to be persistently stored into the asset)

• With legacy usd `Interchange.FeatureFlags.Import.USD 0` import MyCubes.usd
• Set Kinds to Collapse to `Subcomponent`
• Import a different usd file (eg MyCones.usd) with kinds to collapse = `Component`
• Check the reimport options on both imports and observe the first one is `Subcomponent` and the 2nd one is `Component` (as expected)
• Restart unreal
• Check the reimport options on the first import
• Observe it has changed from `Subcomponent` to `Component`

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