Clean up gitignore and add gitkeep files for Laravel storage directories

Co-authored-by: raphaeltm <[email protected]>

Author: Copilot

samples/laravel/app/.gitignore

@@ -3,3 +3,13 @@
 .env
 .env.backup
 .phpunit.result.cache
+/storage/logs/*
+/storage/framework/sessions/*
+/storage/framework/views/*
+/storage/framework/cache/*
+/bootstrap/cache/*
+!/storage/logs/.gitkeep
+!/storage/framework/sessions/.gitkeep
+!/storage/framework/views/.gitkeep
+!/storage/framework/cache/.gitkeep
+!/bootstrap/cache/.gitkeep