chore(s2): update migration guide and codemods for release (#8242)
* remove "comment out isPending"
* Combobox: remove "comment out loadingState" and "comment out onLoadMore"
* update comment
* fix import
* Picker: remove "comment out is isLoading and onLoadMore"
* TableViewL: add guide and codemod for "Move loadingState and onLoadMore from TableBody to TableView"