IllegalStateException will be thrown. This is a no-op if the integration entity already belongs to this folder.
@param item the integration entity to be added.
@return true if the integration entity was added to this folder.
@throws NullPointerException if item is null.
@throws IllegalArgumentException if this folder was created with a specific EntityType, and item is not of that type.
@throws IllegalStateException if item belongs to another folder,
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