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: 6.4.1)
• Cleaned up CHANGELOG.md

Webhooks

• Webhooks disabled prior to merge

[github-actions]

Slowest examples

Top 6 slowest examples (1.91 seconds, 100% of total time)

Example	Description	Time in seconds
spec/default_spec.rb:27	postfix::default on Ubuntu 20.04 [COOK-4423] renders file main.cf with /etc/postfix/cacert.pem	1.06288
spec/sasl_auth_spec.rb:13	postfix::sasl_auth password file template does not display sensitive information	0.67929
spec/default_spec.rb:13	postfix::default on Centos 8 [COOK-4423] renders file main.cf with /etc/pki/tls/cert.pem	0.11357
spec/wrapper_spec.rb:14	test::default _attributes recipes keeps wrapper cookbook default set attributes	0.0566
spec/default_spec.rb:31	postfix::default on Ubuntu 20.04 [COOK-4619] does not set recipient_delimiter	0.00093
spec/default_spec.rb:17	postfix::default on Centos 8 [COOK-4619] does not set recipient_delimiter	0.00086