fix: migrate to Policyfile

[damacus]

Summary

• replace Berksfile with Policyfile.rb
• switch ChefSpec to Policyfile support
• update Copilot setup to run chef install Policyfile.rb

Verification

• chef install Policyfile.rb
• cookstyle --no-server --cache-root /private/tmp/rubocop_cache
• /opt/homebrew/bin/markdownlint-cli2 "**/*.md"
• env GEM_PATH=/opt/chef-workstation/embedded/lib/ruby/gems/3.1.0 /opt/chef-workstation/embedded/bin/rspec
• git diff --check
• kitchen list
• KITCHEN_LOCAL_YAML=kitchen.dokken.yml kitchen list

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This change is 

[github-actions]

Slowest examples

Top 10 slowest examples (0.7 seconds, 99.99% of total time)

Example	Description	Time in seconds
spec/libraries/cruby_spec.rb:13	#cruby_package_deps CentOS CentOS 7 is expected to write log "gcc, bzip2, openssl-devel, libyaml-devel, libffi-devel, readline-devel, zlib-devel, gdbm-devel, ncurses-devel, make, patch"	0.14045
spec/resources/install_spec.rb:14	test::default AlmaLinux 8 is expected to create yum_epel "default"	0.12697
spec/resources/install_spec.rb:13	test::default AlmaLinux 8 is expected to run execute "yum-config-manager --enable powertools"	0.06775
spec/resources/install_spec.rb:12	test::default AlmaLinux 8 is expected to install package "yum-utils"	0.06421
spec/resources/install_spec.rb:15	test::default AlmaLinux 8 is expected not to include recipe "yum-epel::default"	0.05882
spec/libraries/cruby_spec.rb:18	#cruby_package_deps CentOS CentOS 8 is expected to write log "gcc, bzip2, openssl-devel, libyaml-devel, libffi-devel, readline-devel, zlib-devel, gdbm-devel, ncurses-devel, make, patch"	0.0537
spec/libraries/cruby_spec.rb:33	#cruby_package_deps CentOS Ubuntu 16.04 is expected to write log "gcc, autoconf, bison, build-essential, libssl-dev, libyaml-dev, libreadline6-dev, zlib1g-dev, libncurses5-dev, libffi-dev, libgdbm3, libgdbm-dev, make, patch"	0.05272
spec/libraries/cruby_spec.rb:23	#cruby_package_deps CentOS Debian 9 is expected to write log "gcc, autoconf, bison, build-essential, libssl-dev, libyaml-dev, libreadline6-dev, zlib1g-dev, libncurses5-dev, libffi-dev, libgdbm3, libgdbm-dev, make, patch"	0.04946
spec/libraries/cruby_spec.rb:38	#cruby_package_deps CentOS Ubuntu 18.04 is expected to write log "gcc, autoconf, bison, build-essential, libssl-dev, libyaml-dev, libreadline6-dev, zlib1g-dev, libncurses5-dev, libffi-dev, libgdbm5, libgdbm-dev, make, patch"	0.04905
spec/libraries/cruby_spec.rb:28	#cruby_package_deps CentOS Debian 10 is expected to write log "gcc, autoconf, bison, build-essential, libssl-dev, libyaml-dev, libreadline6-dev, zlib1g-dev, libncurses5-dev, libffi-dev, libgdbm6, libgdbm-dev, make, patch"	0.04461