fix(@angular-devkit/build-angular): keep esbuild server active until builder fully stops

Use the now working builder teardown functionality to ensure that the development server
is properly closed when the builder is stopped.

Author: clydin

packages/angular_devkit/build_angular/BUILD.bazel

@@ -340,6 +340,7 @@ LARGE_SPECS = {
         ],
     },
     "browser-esbuild": {
+        "shards": 10,
         "extra_deps": [
             "@npm//buffer",
         ],

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

@@ -148,7 +148,14 @@ export async function* serveWithVite(
     yield { success: true, port: listeningAddress?.port } as unknown as DevServerBuilderOutput;
   }
 
-  await server?.close();
+  if (server) {
+    let deferred: () => void;
+    context.addTeardown(async () => {
+      await server?.close();
+      deferred?.();
+    });
+    await new Promise<void>((resolve) => (deferred = resolve));
+  }
 }
 
 async function setupServer(