GitLab 18.0 – Breaking Changes checks

Manuel Grabowskirequested to merge
gitlab-18-breaking-changes into main

For gitlab-com/support/support-team-meta#6723 (closed)

Noticed that yamllint wouldn't accept URLs without the changed config, so I added that as well.

I copied version_started from the announcement_milestone of the deprecations – that might not make sense. I do think that version_fixed aligning with removal_milestone makes sense – you'll want to run these checks before that version to find out what upcoming breaking changes are relevant to you.

I copied the title from the deprecation notices, set ref_url to the deprecation issue url and workaround_url to the rendered deprecation notice. passing_message and failure_message are freestyled.

I validated the commands only outside of detective so far, I hope to get to try actually running it "for real" tomorrow.

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