Add missing env inlining and hash replacing for standalone mode

[laishere]

Fix #80194.
This adds the missing env inlining and hash replacing for standalone mode bundled by webpack. This issue does not occur in turbopack mode because generate-env is not involved.
To reproduce, please clone https://github.com/hood/nextjs-env-repro. And change the build script to:

  "scripts": {
    "build": "cp .env.local .env.production && rm -rf ./.next/ && next build --webpack --experimental-build-mode compile && next build --webpack --experimental-build-mode generate-env && cp -r ./.next/static ./.next/standalone/.next/static"
  },

This repository uses next@15.3.3, I added --webpack to ensure it works as expected in the latest next@16.0.0 since the default bundler is changed to Turbopack now.
Then run:

pnpm build && node .next/standalone/server.js

The expected result is the NEXT_PUBLIC_ environment varaible is defined for client component.
The actual result is it's undefined, because the referenced js file path (hash) in standalone directory is not correct anymore after generate-env.