refactor(@angular-devkit/build-angular): remove redundant prerendering content from vite devserver

In the devserver we do not perform ahead of time prerendering, instead we perform it during request time.

(cherry picked from commit 84db78d)

Author: alan-agius4

packages/angular_devkit/build_angular/src/builders/dev-server/vite-server.ts

@@ -39,8 +39,6 @@ interface OutputFileRecord {
   servable: boolean;
 }
 
-const SSG_MARKER_REGEXP = /ng-server-context=["']\w*\|?ssg\|?\w*["']/;
-
 function hashContent(contents: BinaryLike): Buffer {
   // TODO: Consider xxhash
   return createHash('sha256').update(contents).digest();
@@ -490,16 +488,6 @@ export async function setupServer(
                 return;
               }
 
-              const potentialPrerendered = outputFiles.get(posix.join(url, 'index.html'))?.contents;
-              if (potentialPrerendered) {
-                const content = Buffer.from(potentialPrerendered).toString('utf-8');
-                if (SSG_MARKER_REGEXP.test(content)) {
-                  transformIndexHtmlAndAddHeaders(url, potentialPrerendered, res, next);
-
-                  return;
-                }
-              }
-
               const rawHtml = outputFiles.get('/index.server.html')?.contents;
               if (!rawHtml) {
                 next();