chore: stop tracking Policyfile lock

[damacus]

Summary

• stop tracking the generated Policyfile.lock.json file
• rely on the existing .gitignore entry to keep locally generated locks out of commits
• let Chef and Test Kitchen resolve the current policy when tests run

Verification

• removed Policyfile.lock.json, then ran chef install Policyfile.rb
• Chef resolved the policy and generated a fresh ignored lock successfully
• cookstyle (33 files, 0 offenses)
• chef exec rspec --format progress (50 examples, 0 failures)
• KITCHEN_LOCAL_YAML=kitchen.dokken.yml kitchen test default-ubuntu-2404 --destroy=always (6 tests, 0 failures; idempotent second converge)

[github-actions]

Slowest examples

Top 10 slowest examples (1.2 seconds, 33.02% of total time)

Example	Description	Time in seconds
spec/unit/library/helper_spec.rb:18	helper methods npm_dist should return a url based on the version	0.17588
spec/unit/resources/nodejs_install_spec.rb:33	nodejs_install package install on rocky linux is expected to disable dnf_module "nodejs"	0.14778
spec/unit/resources/nodejs_repository_spec.rb:17	nodejs_repository on ubuntu is expected to create remote_file "/etc/apt/keyrings/nodesource.asc"	0.14482
spec/unit/resources/nodejs_install_spec.rb:15	nodejs_install package install on ubuntu is expected to create nodejs_repository "nodesource"	0.13688
spec/unit/resources/nodejs_repository_spec.rb:18	nodejs_repository on ubuntu is expected to add apt_preference "nodesource"	0.12002
spec/unit/resources/nodejs_install_spec.rb:89	nodejs_install source install is expected to create link "/usr/local/bin/python"	0.09808
spec/unit/resources/nodejs_install_spec.rb:16	nodejs_install package install on ubuntu is expected to install package "nodejs"	0.09772
spec/unit/resources/nodejs_install_spec.rb:86	nodejs_install source install is expected to install build_essential "install build tools"	0.0958
spec/unit/resources/nodejs_install_spec.rb:111	nodejs_install source install on rocky linux is expected to install package "openssl-devel"	0.09314
spec/unit/resources/nodejs_repository_spec.rb:42	nodejs_repository remove on ubuntu is expected to delete file "/etc/apt/keyrings/nodesource.asc"	0.09308