test: add netlify toml to angular 21 fixture

Author: mrstork

tests/fixtures/angular-21/netlify.toml

@@ -0,0 +1,6 @@
+[build]
+  command="npm run build"
+  ignore="exit 1" ## always build, there might be changes in the plugin
+
+[[plugins]]
+  package="@netlify/angular-runtime"