Update CODEOWNERS to team, switch auto-merge to PAT, ignore code-review.md

[ydesgagn]

Summary

Adjusts repository ownership, CI auto-merge auth, and markdown lint scope.

Key changes:

• .github/CODEOWNERS: replace individual owner @ydesgagn with team @Cloud-Officer/Maintainers for all paths (root, .github/, .gitignore, .markdownlint-cli2.yaml, .yamllint.yml)
• .github/workflows/auto-merge.yml: use GH_BOT_PAT instead of the default GITHUB_TOKEN for the approve step so auto-merge approvals come from the bot account
• .markdownlint-cli2.yaml: exclude docs/code-review.md from markdown linting (generated review output)

Types of changes

• Bugfix (fixes an issue)
• New feature (adds functionality)
• Refactoring (improves code without changing functionality)
• Breaking change (incompatible changes)
• Build or security update (updates dependencies, libraries, or security patches)
• Code style or documentation update (formatting, renaming, or documentation changes)
• Other (please describe):

Checklist

• Unit tests added to validate my fix/feature
• I have manually tested my change
• I did not add automation test. Why ?: configuration-only changes (CODEOWNERS, workflow token, lint ignore)
• Database changes requiring migration with downtime or reprocessing of existing data
• The SOUP file lists the risk Level, requirements and verification reasoning associated with each library
• readme.md includes sections on introduction, installation, usage, and contributing
• docs/architecture.md includes sections on the architecture diagram, software units, software of unknown provenance, critical algorithms and risk controls related to PII and security
• Impact on PII, privacy regulations (CCPA/GDPR/PIPEDA), CIS benchmarks or security (availability/confidentiality/integrity); management must be notified