fix(ci): Update workflows to use release pipeline

[damacus]

Updates workflows to @5.0.3.

Changes

• Updated ci.yml to @5.0.3 with secrets: inherit
• Created release.yml with permissions block
• Created conventional-commits.yml, prevent-file-change.yml, copilot-setup-steps.yml
• Created/updated .markdownlint-cli2.yaml
• Created/updated release-please config files (version: 12.1.9)
• Cleaned up CHANGELOG.md

Webhooks

• Webhooks disabled prior to merge

[github-actions]

Slowest examples

Top 4 slowest examples (2.21 seconds, 100% of total time)

Example	Description	Time in seconds
spec/unit/recipes/default_spec.rb:12	git::default on windows is expected to install git_client "default"	1.20687
spec/unit/recipes/windows_spec.rb:11	git::windows is expected to install git_client "default"	0.84331
spec/unit/recipes/default_spec.rb:18	git::default on linux is expected to install git_client "default"	0.10044
spec/unit/recipes/source_spec.rb:14	git::source is expected to install_from_source git_client "default"	0.06723