feat(@angular/build): utilize ssr.entry in Vite dev-server when available

[alan-agius4]

feat(@angular/build): utilize ssr.entry in Vite dev-server when available
When ssr.entry (server.ts) is defined, Vite will now use it in the dev-server. This allows API and routes defined in server.ts to be accessible during development. This feature requires the new @angular/ssr APIs, which are currently in developer preview.

feat(@angular/ssr): add createRequestHandler and createNodeRequestHandler utilities

Introduced the createRequestHandler and createNodeRequestHandler utilities to expose middleware functions from the server.ts entry point for use with Vite.
This provides flexibility in integrating different server frameworks, including Express, Hono, and Fastify, with Angular SSR.

Examples:

Express

export default createNodeRequestHandler(app);

Nest.js

const app = await NestFactory.create(AppModule);
export default createNodeRequestHandler(app);

Hono

const app = new Hono();
export default createRequestHandler(app.fetch);

Fastify

export default createNodeRequestHandler(async (req, res) => {
  await app.ready();
  app.server.emit('request', req, res);
});

[clydin]

We should consider consolidating some of the E2E test logic here at some point.

Otherwise, LGTM.

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