Update Vite build output and remove test file

Added Vite build output directories to .gitignore and configured Vite to output to ../wwwroot. Removed obsolete App.spec.ts test file from GUI/src/__tests__.

GUI/vite.config.ts

@@ -15,4 +15,7 @@ export default defineConfig({
       '@': fileURLToPath(new URL('./src', import.meta.url))
     },
   },
+  build: {
+    outDir: "../wwwroot"
+  }
 })