Port Markdown EOL whitespace linting to project

What does this MR do and why?

Port the tests for EOL whitespace from docs-gitlab to this project.

Output from job: https://gitlab.com/gitlab-org/technical-writing/docs-gitlab-com/-/jobs/9426573643.

Related to Update documentation for monthly maintenance tasks (#270 - closed)

Merge request acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

Edited by Marcel Amirault

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