fix(@angular/build): resolve browser provider packages using project resolver

This ensure that the dependencies are resolved from the project root.

Author: alan-agius4

packages/angular/build/src/builders/unit-test/runners/vitest/browser-provider.ts

@@ -67,7 +67,7 @@ export async function setupBrowserConfiguration(
   if (providerName) {
     const providerPackage = `@vitest/browser-${providerName}`;
     try {
-      const providerModule = await import(providerPackage);
+      const providerModule = await import(projectResolver(providerPackage));
 
       // Validate that the imported module has the expected structure
       const providerFactory = providerModule[providerName];