Editor Performance issue : Loading/unloading multiple Levels / Level Instances triggers each time a call to FActorFolders::RebuildFolderListForWorld

Revisit how FActorFolders are updated when loading/unloading Levels (level instances).
The code should maintain the folder list instead of rebuilding everything.

Steps to Reproduce

• Place thousands of Level Instances on a streaming level
• Hide/unhide the streaming level
• Notice how long it takes to load the levels although they don't necessarily contain too much actual data

[UE-23848] Bug Status

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