TMP: Install Generator use allow-skip-specs frontend template

We want to be able to skip frontend specs from extension that
run system specs against the generated dummy app.

See solidusio/solidus_starter_frontend#400

core/lib/generators/solidus/install/app_templates/frontend/starter.rb

@@ -1 +1 @@
-apply 'https://github.com/solidusio/solidus_starter_frontend/raw/main/template.rb'
+apply 'https://github.com/solidusio/solidus_starter_frontend/raw/allow-skip-specs/template.rb'