App Build Stats (#38884)

## Bug

- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Errors have helpful link attached, see `contributing.md`

## Feature

- [ ] Implements an existing feature request or RFC. Make sure the feature request has been accepted for implementation before opening a PR.
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Documentation added
- [ ] Telemetry added. In case of a feature if it's used or not.
- [ ] Errors have helpful link attached, see `contributing.md`

## Documentation / Examples

- [ ] Make sure the linting passes by running `pnpm lint`
- [ ] The examples guidelines are followed from [our contributing doc](https://github.com/vercel/next.js/blob/canary/contributing.md#adding-examples)


Co-authored-by: Tim Neutkens <6324199+timneutkens@users.noreply.github.com>
Co-authored-by: JJ Kasper <22380829+ijjk@users.noreply.github.com>

packages/next/build/entries.ts

@@ -19,7 +19,7 @@ import {
 import {
   CLIENT_STATIC_FILES_RUNTIME_AMP,
   CLIENT_STATIC_FILES_RUNTIME_MAIN,
-  CLIENT_STATIC_FILES_RUNTIME_MAIN_ROOT,
+  CLIENT_STATIC_FILES_RUNTIME_MAIN_APP,
   CLIENT_STATIC_FILES_RUNTIME_REACT_REFRESH,
   EDGE_RUNTIME_WEBPACK,
 } from '../shared/lib/constants'
@@ -506,14 +506,14 @@ export function finalizeEntrypoint({
     // Client special cases
     name !== 'polyfills' &&
     name !== CLIENT_STATIC_FILES_RUNTIME_MAIN &&
-    name !== CLIENT_STATIC_FILES_RUNTIME_MAIN_ROOT &&
+    name !== CLIENT_STATIC_FILES_RUNTIME_MAIN_APP &&
     name !== CLIENT_STATIC_FILES_RUNTIME_AMP &&
     name !== CLIENT_STATIC_FILES_RUNTIME_REACT_REFRESH
   ) {
     // TODO-APP: this is a temporary fix. @shuding is going to change the handling of server components
     if (appDir && entry.import.includes('flight')) {
       return {
-        dependOn: CLIENT_STATIC_FILES_RUNTIME_MAIN_ROOT,
+        dependOn: CLIENT_STATIC_FILES_RUNTIME_MAIN_APP,
         ...entry,
       }
     }