chore: update codeowners & labeler

[mkurapov]

Changes proposed in this pull request

• Removing CODEOWNERS file, to not tag our tech writers when documentation change happens
• add type: documentation label only when md files are changed in the documentation package

Context

Fixes #2616

Checklist

• [x] Related issues linked using fixes #number
• [ ] Tests added/updated
• [ ] Documentation added
• [ ] Make sure that all checks pass
• [ ] Bruno collection updated

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