Get rid of old ResultModel and unite to new model

[U-lis]

Currently, all the equipment crafting actions(CombinationEquipment, CustomEquipmentCraft, ItemEnhancement) are using different ResultModel (but based on same class: AttachmentActionResult).

Some of ResultModel are from old, unused legacy code (e.g., ItemEquipment7.ResultModel, RapidCombination5.ResultModel) wihch makes the codebase messy and difficult to manage.

We SHOULD refactor this to new united result model

NOTE

ResultModel is already in use on millions of sites, and the new result model can seamlessly migrate all the existing states.