next.js

fe4797ea - refactor(turbopack): Remove cast to `EcmascriptModuleAsset` (#68427)

refactor(turbopack): Remove cast to `EcmascriptModuleAsset` (#68427) ### What? Now we have tree shaking implementation but it uses `EcmascriptModulePartAsset` as the module type. So casting to `EcmascriptModuleAsset` can break the tree shaking. This PR also removes `special exports` of turbopack, which is cumbersome. The previous analysis logic for those special exports may depend on the value being `EcmascriptModuleAsset`, which is resolved in this PR. ### Why? Clean code & for future woork. ### How? Closes PACK-3175