feat: Migrate existing apps with application builder to use index.server.html in server file

[pawelfras]

This PR provides an automation that migrates SPA apps using application builder (created with SPA >=2211.19) to use server/index.server.html instead of browser/index.html due to changes in Angular 19 and what's the output of built application.

QA (installation script):

• change version of all packages to 2212.32.0 (temporary test value)
• build and deploy Spartacus packages locally:
  npx ts-node ./tools/schematics/testing.ts in the SPA root folder
• create new app npx @angular/cli@17 new my-app --standalone=false --style=scss --routing=false
• go to the project's directory and install latest SPA 2211.x, e.g. from RBSC
• migrate to Angualr 18, then 19 (following migration docs
• update SPA to v2212.32.0:
  `npx @angular/cli@17 update @spartacus/schematics@latest
• verify if migration runs (logs in console):
  
• verify server.ts file if changes are applied:
  
• run npm run build and NODE_TLS_REJECT_UNAUTHORIZED=0 run serve:ssr:my-app to test if app works