fix(ci): Update workflows to use release pipeline

[damacus]

Updates GitHub Actions workflows to use the new release pipeline (@5.0.3).

Changes

• Updated ci.yml workflow version to @5.0.3
• Added secrets: inherit to lint-unit job
• Updated action versions to @main (chef-install, test-kitchen)
• Created release.yml workflow with explicit secrets configuration
• Created conventional-commits.yml workflow
• Created prevent-file-change.yml workflow
• Created copilot-setup-steps.yml workflow
• Created release-please-config.json
• Created .release-please-manifest.json matching metadata.rb version (7.0.29)
• Updated CHANGELOG.md formatting (removed Unreleased section, converted list items from - to *)
• Updated branch protection rules to use new status check names

Webhooks

• Webhooks have been disabled for this repository prior to merge

[github-actions]

Slowest examples

Top 9 slowest examples (0.7 seconds, 99.99% of total time)

Example	Description	Time in seconds
spec/unit/recipes/default_spec.rb:69	test::default deletes cron_d[delete_cron]	0.16827
spec/unit/recipes/default_spec.rb:7	test::default enables and starts service[cron]	0.08994
spec/unit/recipes/default_spec.rb:32	test::default creates cron_d[fixnum-job]	0.07328
spec/unit/recipes/default_spec.rb:58	test::default creates if missing cron_d[no_value_check]	0.07196
spec/unit/recipes/default_spec.rb:50	test::default creates cron_d[nil_value_check]	0.06173
spec/unit/recipes/default_spec.rb:12	test::default creates cron_d[bizarrely-scheduled-usage-report]	0.05968
spec/unit/recipes/default_spec.rb:42	test::default creates cron_d[predefined_value_check]	0.05915
spec/unit/recipes/default_spec.rb:22	test::default creates cron_d[test-month-usage-report]	0.05859
spec/unit/recipes/default_spec.rb:65	test::default creates file[/etc/cron.d/delete_cron]	0.05793