fix(@angular/build): isolate Vite cache per build configuration in dev server

Running two ng serve instances for the same project with different
configurations (e.g., different locales) caused "504 Outdated Optimize Dep"
errors because both instances shared the same Vite optimizer cache directory.

The fix includes the build configuration name in the Vite cache directory
path, preventing cache conflicts between concurrent dev server instances.

Closes angular#31700

Author: maruthang

packages/angular/build/src/builders/dev-server/vite/server.ts

@@ -162,7 +162,14 @@ export async function setupServer(
    */
   const preTransformRequests =
     externalMetadata.explicitBrowser.length === 0 && ssrMode === ServerSsrMode.NoSsr;
-  const cacheDir = join(serverOptions.cacheOptions.path, serverOptions.buildTarget.project, 'vite');
+  // Include the build configuration in the cache path to prevent conflicts when running
+  // multiple dev server instances with different configurations (e.g., different locales).
+  const cacheDir = join(
+    serverOptions.cacheOptions.path,
+    serverOptions.buildTarget.project,
+    'vite',
+    serverOptions.buildTarget.configuration ?? '',
+  );
 
   const configuration: InlineConfig = {
     configFile: false,